Arctic Experiences Hottest Conditions in 125 Years Amid Record Low Sea Ice, According to NOAA Report

The previous season marked the highest temperatures in the Arctic for the past 125 years. March, typically the month with the greatest sea ice extent, recorded the lowest levels in 47 years of satellite data. The North American tundra exhibited unprecedented greenness, showing more vegetation than ever before.

These findings, released on Tuesday in the National Oceanic and Atmospheric Administration’s annual Arctic Report Card, illustrate the swift and dramatic changes taking place in the region as global temperatures rise.

“The Arctic is warming at a pace that exceeds the global average, with the last decade being some of the hottest on record,” stated Steve Sarr, NOAA’s acting principal scientist and associate administrator for ocean and atmospheric research.

Due to this warming, “over 200 watersheds in the Alaskan Arctic are turning orange as permafrost thaws, ecosystems evolve, and elements like iron are released into rivers,” Thursday indicated. The research highlighted increased acidity and higher levels of toxic metals in these discolored streams.

This is just one of many consequences of climate change affecting the region detailed in the report. This marks the 20th year that NOAA has published the Arctic report card, which originally surfaced during President Donald Trump’s second term.

The Trump administration has worked to diminish or eliminate other climate change reports, including the National Climate Assessment and the extensive climate disaster database. President Trump has labeled climate change a “swindler” and is actively trying to reduce the Environmental Protection Agency’s power to regulate greenhouse gas emissions.

Matthew Druckenmiller, a writer of the report and researcher at the National Snow and Ice Data Center, affirmed during a Tuesday press conference that the team faced “no political interference concerning our findings.”

Independent scientists consulted by NBC News remarked that the report conveys a similarly urgent tone and message as in previous years, with a few minor distinctions.

“Frankly, we haven’t observed a significant shift in tone compared to prior Arctic report cards, which is encouraging,” commented Tom Di Liberto, a climate scientist and media director at Climate Central. “The implications of their conclusions remain consistent with earlier Arctic report cards. The Arctic acts as a warning sign.”

Di Liberto, who previously worked in NOAA’s communications office before his position was cut in March as part of staff reductions, noted that the previous year’s report emphasized reducing fossil fuel production, whereas this year’s report does not mention fossil fuels at all. Otherwise, he identified no major differences.

NOAA unveiled a report at the American Geophysical Union’s annual meeting in New Orleans, highlighting how climate change is disrupting ecosystems and threatening livelihoods in the Arctic. This event is one of the largest scientific gatherings of the year, attracting thousands of scientists.

Mark Alessi, a climate scientist and fellow at the Union of Concerned Scientists, remarked that the report card “effectively communicates the realities of what is occurring on the ground in the Arctic.”

“Anyone reading this will understand that we continue to raise the alarm,” he emphasized.

In strong language, the report’s authors point out that proposed budget cuts to scientific programs collecting data in the Arctic, including satellite programs monitoring sea ice, threaten to undermine the data collection essential for this report and related decision-making.

“Aging infrastructure, along with risks to funding and staffing, could further erode existing AONs.” [Arctic Observing Network] Gaps are forming that hinder long-term trend analysis and decision-making,” the report warned.

Specifically, the report highlights several satellites within the Defense Weather Satellite Program set to be decommissioned in 2026. The cessation of these satellites will restrict sea ice measurements. It also mentions that the tundra greenness dataset will remain unchanged due to NASA funding cuts, and other climate datasets may also be jeopardized by proposed federal budget cuts in fiscal year 2026.

The Arctic is warming two to four times quicker than the rest of the globe, a phenomenon known as Arctic amplification. This process alters ocean currents and the degree of sunlight absorbed by the Earth’s surface at the poles.

“This feedback loop leads to the loss of sea ice and land ice, increased absorption of sunlight, and consequently, more rapid warming,” explained Alessi.

Temperature records are categorized by the Arctic water year, with the latest data ranging from October 2024 to September 2025.

Source: www.nbcnews.com

New Study Shows Baker’s Yeast Can Endure Stress Conditions Similar to Mars

Investigating the potential for life to endure under extraterrestrial circumstances is a key aim of astrobiology. In this recent study, researchers utilized the robust model organism, baker’s yeast, to evaluate the impact of Mars-like environments. They discovered that the yeast can resist shock waves and perchlorate treatment, two stress factors linked to Mars. Furthermore, yeast adapt to Martian-like conditions by forming conserved RNA-protein complexes.



A model demonstrating the significance of RNP condensates in facilitating survival under Mars-like stress conditions. Image credit: Dhage et al., doi: 10.1093/pnasnexus/pgaf300.

“With advancements in space science and astrobiology, examining Mars’s potential to harbor life forms is gaining considerable interest,” stated Dr. Purusharth Rajguru and his team at the Indian Institute of Science.

“Mars presents a range of extreme environmental challenges that any potential life forms would need to overcome.”

“Hence, it is essential to comprehend its unique and harsh environmental conditions.”

“The stressors on Mars include: (i) high-intensity shock waves from meteorite impacts, (ii) extreme fluctuations in temperature and pressure, (iii) ionizing radiation and solar ultraviolet radiation resulting from a thin atmosphere, and (iv) chaotropic agents such as perchlorates.”

“These factors create significant barriers to the survival of potential life.”

In this investigation, the researchers examined budding yeast, a well-known model organism for studying shock waves and perchlorate.

One reason for selecting this yeast is its previous studies conducted in space environments.

When subjected to stress, yeast, humans, and various other organisms form ribonucleoprotein (RNP) condensates, structures composed of RNA and proteins that safeguard the RNA and influence the progression of mRNA.

When a stressor subsides, RNP condensates, which include stress granules and subtypes called P bodies, disassemble.

Yeast subjected to a shock wave with a Mach strength of 5.6 survived, exhibiting slower growth rates, similar to those observed in yeast exposed to 100 mM sodium perchlorate salt (NaClO4)—a concentration akin to that found in Martian soil.

The yeast cells also endured the combined stress of shock waves and perchlorate exposure.

In both situations, the yeast accumulated RNP condensates, the researchers noted.

The shock wave triggered the formation of stress granules and P bodies, while perchlorate prompted the yeast to generate P bodies but not stress granules.

Mutants that were unable to assemble RNP condensates fared poorer under Martian stress conditions.

Transcriptome analysis uncovered specific RNA transcripts affected by the Mars-like scenarios.

“This finding highlights the significance of yeast and RNP condensates in understanding how Martian conditions affect life,” the scientists concluded.

For further details, refer to their paper published in today’s issue of PNAS Nexus.

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Riya Dage et al. 2025. Ribonucleoprotein (RNP) condensates regulate survival in response to Mars-like stress conditions. PNAS Nexus 4(10):pgaf300; doi: 10.1093/pnasnexus/pgaf300

Source: www.sci.news

40 Years of Light from Earth May Harbor Conditions Favorable for Life

Artist’s Impression of the Planet TRAPPIST-1e

NASA/JPL-Caltech

Exciting indications suggest that one of the planets in the TRAPPIST-1 star system, located around 40 light-years away, may have an atmosphere suitable for life. However, scientists aim to obtain 15 additional images to confirm this.

TRAPPIST-1 is a small red star hosting at least seven planets. Discovered in 2016, it has become a focal point for astronomers hunting for extraterrestrial life, as three of its planets lie within the Goldilocks Zone, where liquid water can exist.

Ryan McDonald from St Andrews University, UK, states that the discovery of TRAPPIST-1 stirred considerable excitement among astronomers. However, subsequent imaging of three exoplanets—two of which are in the Goldilocks zone—did not identify any atmospheres, which was a letdown. Yet, McDonald and his team have maintained a focus on TRAPPIST-1e, situated at the center of this zone, and now hold a positive outlook.

In 2023, McDonald and colleagues utilized the James Webb Space Telescope to examine TRAPPIST-1e and have continued to enhance their images of this world. Through the analysis of starlight alterations as distant planets cross in front of stars, scientists can deduce the composition of atmospheres and identify beneficial life-sustaining chemicals.

Nonetheless, TRAPPIST-1’s classification as a red dwarf complicates these measurements due to its cooler nature compared to our sun. This cooling effect can lead to prevalent atmospheric chemicals like water also existing within the star itself. Consequently, it’s crucial to differentiate TRAPPIST-1e’s atmospheric signals from those of the star’s light. This challenging task requires innovative models and extensive effort. Initial findings suggest that TRAPPIST-1e may possess a life-friendly atmosphere, potentially representing a pivotal moment in the search for habitable conditions in the universe.

“The data exhibits fluctuations in accordance with atmospheric modeling, aligning well with nitrogen-rich atmospheres and possibly including methane,” remarks McDonald. “Among all the spectra collected from the TRAPPIST-1 system, this is the most promising, indicating potential atmospheric components.”

Should the nitrogen-rich atmosphere hypothesis be confirmed in subsequent analyses, McDonald states the next step will be to search for gases such as methane or carbon dioxide and utilize climate models to assess surface temperatures and the potential for liquid water.

However, the researchers caution that current data cannot entirely dismiss the possibility that TRAPPIST-1e is merely a barren rock. Additional observations are imperative. They have data from four JWST observations but aim for an additional 15 in the near future. “We need to minimize the error margins,” comments McDonald.

Matthew Jenge from Imperial College London notes that while many exoplanets are being discovered, astronomers are eager to pinpoint those with conditions conducive to life.

“Complexities arise because a planet can be in the right orbital zone but, with the wrong atmosphere, may become inhospitable like Venus. Astronomers are investigating numerous exoplanets, and eventually, one will likely be found with a nitrogen/oxygen-rich atmosphere. Photosynthesis may be key to achieving oxygen richness,” he says.

“If [TRAPPIST-1e] is habitable, consider what transpired on that planet over the past 7.6 billion years. The older the planet, the higher the likelihood of developing intelligent life,” he adds.

McDonald believes that by 2060, data may reveal multiple planets whose existence is hard to explain without including life forms, though he stresses that proving the existence of extraterrestrial life is still a distant goal. “We remain skeptical,” he concludes.

Source: www.newscientist.com

Doctors Create AI Stethoscope Capable of Identifying Major Heart Conditions in Just 15 Seconds

A doctor has successfully created an AI-powered stethoscope that can identify three cardiac conditions in just 15 seconds.

The classic stethoscope, which was invented in 1816, has been crucial for listening to internal body sounds and has remained a vital tool in medical practice for over two hundred years.

The research team is now working on a sophisticated AI-enhanced version that can diagnose heart failure, heart valve issues, and irregular heartbeats.

Developed by researchers at Imperial College London and Imperial College Healthcare NHS Trust, this innovative stethoscope can detect minute variations in heartbeat and blood flow that are beyond the capacity of human ears, while simultaneously performing quick ECG readings.


The details of this groundbreaking advancement that could enhance the early diagnosis of these conditions were shared with thousands of doctors during the European Heart Association Annual Meeting in Madrid, the largest cardiac conference globally.

Timely diagnosis is crucial for heart failure, heart valve disease, and irregular heart rhythms, enabling patients to access life-saving medications before their condition worsens.

A study involving around 12,000 patients from a UK GP practice tested individuals exhibiting symptoms like shortness of breath and fatigue.

Those who were evaluated using the new technology were twice as likely to receive a diagnosis of heart failure compared to similar patients who were not subjected to this method.

Patients were three times more likely to be diagnosed with atrial fibrillation—an irregular heart rhythm that heightens the stroke risk—and nearly twice as likely to be identified with heart valve disease, characterized by malfunctioning heart valves.


The AI-led stethoscope identifies subtle differences in heartbeat and blood flow that are imperceptible to the human ear while recording ECG. Photo: Eko Health

Dr. Patrick Bectiger from Imperial College London remarked:

“It’s amazing to utilize a smart stethoscope for a quick 15-second assessment, allowing AI to promptly provide results indicating whether a patient has heart failure, atrial fibrillation, or heart valve disease.”

Manufactured by Eko Health in California, the device resembles a credit card in size. It is placed on a patient’s chest to record electrical signals from the heart while a microphone picks up the sound of blood circulation.

This data is transmitted to the cloud—an encrypted online storage space—where AI algorithms analyze the information to uncover subtle heart issues that may be overlooked by humans.

Results indicating whether a patient should be flagged for any of the three conditions will be sent back to a smartphone.

While breakthroughs like these can carry risks of misdiagnosis, researchers stress that AI stethoscopes should only be employed for patients presenting heart-related symptoms, not for routine screening in healthy individuals.

However, accelerating the diagnosis process can ultimately save lives and reduce healthcare costs.

Dr. Mikhilkelsiker, also from Imperial College, stated:

“This test demonstrates that AI-enabled stethoscopes can make a significant difference, providing GPs with a rapid and straightforward method to detect issues early, ensuring patients receive timely treatment.”

“Early diagnosis allows individuals to access the necessary treatment to enhance their longevity,” emphasized Dr. Sonya Babu Narayan, clinical director of the British Heart Foundation, which sponsored the research alongside the National Institute of Health and Therapy (NIHR).

Professor Mike Lewis, Director of the Innovation Science Department at NIHR, remarked, “This tool represents a transformative advance for patients, delivering innovation right into the hands of GPs. AI stethoscopes empower local practitioners to identify problems sooner, diagnose patients within their communities, and address leading health threats.”

Source: www.theguardian.com

Effective Solutions for Chronic Sinus Conditions May Fall Short

Individuals with sinusitis may experience inflammation in their sinuses.

Science Photo Library/Alamy

Surgery is generally considered a last option for those suffering from chronic nasal blockages or persistent runny noses. However, it may prove to be more effective than the commonly prescribed antibiotics for this condition in certain circumstances.

Chronic sinusitis affects 9% of the global population. It arises when the sinuses—the cavities that produce mucus—become inflamed. Typical symptoms include nasal blockage or discharge, a diminished sense of smell, and facial pain lasting over 12 weeks. The specific cause is often unclear, although it can stem from viral infections or alterations in the nasal microbiome.

The primary treatment typically starts with anti-inflammatory nasal sprays and daily saline rinses. If symptoms persist, doctors may prescribe a three-month course of clarithromycin, utilized more for its anti-inflammatory effects than its antibacterial action, according to Carl Philpott from the University of East Anglia, UK.

As a last resort, patients may undergo surgery to enlarge their sinuses or to remove benign growths, such as polyps. This approach is needed in approximately 5% of cases. Nonetheless, no prior studies have directly contrasted the outcomes of surgery with those of antibiotics.

To address this gap, Philpott and his team enrolled over 500 adults with chronic sinusitis. Participants evaluated the severity of 22 symptoms, including facial pain and nasal congestion, averaging a score of 55 out of 110.

Participants were then randomly assigned to either a three-month regimen of clarithromycin, placebo pills, or surgical intervention. All were also instructed to use nasal sprays and conduct saline rinses.

Six months later, those on clarithromycin or placebo reported a symptom severity reduction of around 10 points compared to their baseline scores. According to Claire Hopkins from King’s College London, the improvement was noted in both the antibiotic and placebo groups, indicating it was likely due to nasal spraying and rinsing.

Conversely, the surgical group experienced a symptom improvement of approximately 30 points compared to their pre-surgery state, suggesting that such procedures should be prioritized over antibiotics, Hopkins believes.

However, there are significant factors to consider. Around 80% of the participants had nasal polyps and might have been at risk of contracting coronavirus during the study, as it was conducted amid the Covid-19 pandemic. Hopkins states that this type of inflammation often leads to polyps. More research is required to determine if the findings apply to those without polyps, who may experience different inflammation types.

Topics:

Source: www.newscientist.com

Burning Man Attendees Confront Extreme Weather Conditions

Las Vegas – This year’s Burning Man festival attendees have not had much cooperation from Mother Nature.

Amid fierce sandstorms, high temperatures, and humidity over the weekend, there’s a looming threat of rain and potential flooding in the coming days, marking a chaotic start to the annual event in Nevada’s Black Rock Desert.

A powerful sandstorm with winds reaching 50 mph swept through Black Rock City on Saturday, creating disorder at campsites and causing significant travel delays in the area. The National Weather Service issued a Dust Storm Advisory, citing a “blowing dust wall” heading north that evening.

According to a Burning Man spokesperson, NBC News reported four minor injuries related to the wind and dust.

The storm caused traffic disruptions due to strong winds and reduced visibility, leading to the closure of Black Rock City gates. For those already inside, swirling dust overturned many campsites and scattered personal belongings.

“If you’re in Black Rock City, secure your camp and refrain from driving,” warned the official Burning Man account monitoring conditions both inside and outside Black Rock City. This was shared on x on Saturday.

Participants described the winds as relentless for over an hour, remarking, “The desert is always trying to kill you.” They expressed that it was “arguably the most frightening experience” at Burning Man. This sentiment was shared on Facebook.

Around 70,000 individuals are expected to attend the festival, which continues until September 1st.

On the festival’s first day, northern Nevada experienced humidity levels nearing 100°F, with about 57% humidity. Another dust advisory was issued that evening by the National Weather Service, predicting 50 mph winds and visibility under a mile across parts of central Nevada.

There were also possibilities of rain and thunderstorms that temporarily halted vehicle traffic by locking the gates in Black Rock City.

“The current travel time for vehicles on Gate Road is estimated at seven hours when the gates reopen,” noted a festival official. This was updated on x Sunday night.

Cleanup efforts are in progress, but the volatile weather conditions persist.

Rain and thunderstorms are forecast for Monday and beyond. The dusty lake beds are prone to flooding, and excessive rainfall could transform the playa into muddy terrain.

In 2023, torrential rains trapped thousands of Burning Man participants in thick mud. Attendees were advised to “evacuate to shelter,” leading to a report of one fatality by the Pershing County Sheriff’s Office.

Source: www.nbcnews.com

Humans Experience Rare Conditions After Querying CHATGPT and Eliminating Salt

American medical journals are cautioning against the use of ChatGPT for health-related information after a case involving men who developed a rare condition following their discussions with chatbots about eliminating table salt from their diets.

A chronicled case in internal medicine highlights that a 60-year-old man experienced bromism, also referred to as bromide toxicity, after consulting ChatGPT.

This case study mentioned that bromism was a “well-recognized” syndrome in the early 20th century, contributing to psychiatric hospitalizations for about one in ten individuals during that period.

After learning about the negative effects of sodium chloride (table salt), the patient sought guidance from ChatGPT on eliminating chloride from his diet and disclosed that he had been consuming sodium bromide for three months. This action occurred despite previous reading that “chloride can be exchanged for bromide, but is likely for other purposes such as cleaning.” Sodium bromide was historically used as a sedative in the early 20th century.


The article’s author, an alumnus of Washington University in Seattle, emphasized that this incident underscores “how the use of artificial intelligence contributes to preventable health outcomes.”

They noted that the lack of access to the patient’s ChatGPT conversation logs hindered their ability to ascertain the specific advice the man received.

Regardless, the author found that when querying ChatGPT for alternatives to chloride, the responses also included bromide, lacking specific health warnings, and did not inquire about the author’s reasons for seeking such information; “I think healthcare professionals typically would do that,” they remarked.

The author cautioned that ChatGPT and other AI applications can “generate scientific inaccuracies and critically debate results, ultimately spreading misinformation.”

OpenAI, the creator of ChatGPT, was approached for a statement.

The company recently announced an upgrade for its chatbot, asserting that one of its notable strengths lies in health-related queries. Powered by the GPT-5 model, ChatGPT excels in answering health questions and aims to be more proactive in “flagging potential concerns” like serious physical and mental illnesses. However, it stressed that chatbots cannot replace expert advice.

An article published last week before the release of GPT-5 indicated that the patient had likely interacted with an earlier version of ChatGPT.

While recognizing that AI could serve as a conduit between scientists and the public, the article warned that the technology also risks disseminating “decontextualized information,” emphasizing that medical professionals would rarely suggest sodium bromide in response to inquiries about replacing table salt.

The authors encouraged physicians to consider using AI in understanding where patients derived their information.

The author narrated that a patient suffering from bromism introduced himself at a hospital and expressed concern about a neighbor possibly being addicted to him. He also mentioned having several dietary restrictions and was noted to have paranoia regarding the water provided to him despite intense thirst.

The patient attempted to leave the hospital within 24 hours of admission and was subsequently sectioned before receiving treatment for mental health issues. Once stabilized, he reported various other bromism symptoms, including facial acne, relentless thirst, and insomnia.

Source: www.theguardian.com

Microsoft Claims AI Systems Outperform Doctors in Diagnosing Complex Health Conditions

Microsoft is unveiling details about artificial intelligence systems that outperform human doctors in intricate health assessments, paving a “path to medical closeness.”

The company’s AI division, spearheaded by British engineer Mustafa Suleyman, has created a system that emulates a panel of specialized physicians handling “diagnostically complex and intellectually demanding” cases.

When integrated with OpenAI’s advanced O3 AI model, Microsoft claims its method “solved” more than eight out of ten carefully selected case studies for diagnostic challenges. In contrast, practice physicians with no access to colleagues, textbooks, or chatbots achieved an accuracy rate of only 2 out of 10 on these same case studies.

Microsoft also highlighted that this AI solution could be a more economical alternative to human doctors, as it streamlines the process of ordering tests.

While emphasizing potential cost reductions, Microsoft noted that it envisions AI as a complement to physician roles rather than a replacement.

“The clinical responsibilities of doctors extend beyond merely diagnosing; they must navigate uncertainty in ways that AI is not equipped to handle, and build trust with patients and their families,” the company explained in a blog post announcing the research intended for peer review.

Nevertheless, slogans like “The Road to Overmed Medical” hint at the possibility of transformative changes in the healthcare sector. Artificial General Intelligence (AGI) denotes systems that replicate human cognitive abilities for specific tasks, while superintelligence is a theoretical concept referring to systems that surpass overall human intellectual capacity.

In discussing the rationale for their study, Microsoft raised concerns about AI’s performance on U.S. medical licensing exams, a crucial assessment for acquiring medical licenses in the U.S. The multiple-choice format relies heavily on memorization, which may “exaggerate” AI capabilities compared to in-depth understanding.

Microsoft is working on a system that mimics real-world clinicians by taking step-by-step actions to arrive at a final diagnosis, such as asking targeted questions or requesting diagnostic tests. For instance, patients exhibiting cough or fever symptoms may need blood tests and chest x-rays prior to receiving a pneumonia diagnosis.

This innovative approach by Microsoft employs intricate case studies sourced from the New England Journal of Medicine (NEJM).

Suleyman’s team transformed over 300 of these studies into “interactive case challenges” to evaluate their method. Microsoft’s strategy incorporated existing AI models developed by ChatGPT creators OpenAI, Meta from Mark Zuckerberg, Anthropic, Grok from Elon Musk, and Google’s Gemini.

The company utilized a specific model for determining tests and diagnostics, employing AI systems such as tailored agents known as “diagnostic orchestrators.” These orchestrators effectively simulate a doctor’s panel, aiding in reaching a diagnosis.

Microsoft reported that in conjunction with OpenAI’s advanced O3 model, over eight of the ten NEJM case studies have been “solved.”

Microsoft believes its approach has the potential to encompass multiple medical fields, enabling a broad and in-depth application beyond individual practitioners.

“Enhancing this level of reasoning could potentially reform healthcare. AI can autonomously manage patients with routine care and offer clinicians sophisticated support for complex cases.”

However, Microsoft acknowledges that the technology is not yet ready for clinical implementation, noting that further testing with an “Orchestrator” is necessary to evaluate performance in more prevalent symptoms.

Source: www.theguardian.com

What is a Heat Dome? Understanding Hot and Humid Weather Conditions

Sweltering and humid conditions have impacted nearly the entire eastern U.S. this week, triggered by “heat domes” settling over various regions.

On Wednesday, a heat advisory impacted approximately 150 million individuals, with temperatures exceeding 95 degrees Fahrenheit spreading through the Ohio Valley and along the East Coast. The National Weather Service predicts that “extremely dangerous heat” will persist until Thursday.

But what exactly is a heat dome, and how does it contribute to extreme heat?

Heat domes form when a strong high-pressure system remains stationary over an area, trapping warm air underneath like a lid on a pot.

These thermal domes are typically influenced by the jet stream’s behavior. The jet stream is a fast-moving ribbon of air that flows from west to east in the Northern Hemisphere, impacting weather patterns.

The jet stream is powered by the temperature disparity between the chilly polar regions and warm southern air masses. As it travels around the globe, it can create ripples that form troughs and ridges, leading to unusual weather phenomena.

For instance, certain ripples can intensify cold snaps, while others can move and amplify heat, resulting in higher humidity levels.

Heat domes can persist for days or even weeks, contributing to prolonged heat waves that can be deadly. Heat-related illnesses and fatalities can impact individuals of all ages, but children, those with pre-existing health conditions, and older adults are especially vulnerable to sudden temperature spikes.

Research indicates that climate change is increasing the frequency, intensity, and duration of heat waves globally. The hottest years on record since 1850 have all occurred within the last decade, according to the National Oceanic and Atmospheric Administration.

Some respite is anticipated later this week across the Midwest and East Coast, although temperatures are expected to remain high in the days ahead.

Source: www.nbcnews.com

Warm and Humid Climate Creates Ideal Conditions for Pterosaurs to Soar 220 Million Years Ago

A recent study by paleontologists integrated data on the ancient climate of a specific region with fossil distribution information regarding Triassic eye pteraurauromorphs (pterosaurs + lagerpetids).

Foffa et al. Lagerpetids, alongside overall pterygoid morphospace, likely thrived in southwestern Pangaea (i.e. modern-day South America), indicating that pterosaurs may have originated at lower latitudes in the Northern Hemisphere. Image credit: James Kuether.

“Pterosaurs were the first vertebrates to evolve powered flight more than 60 million years ago—the oldest known birds,” stated Davide Foffa, a paleontologist from the University of Birmingham.

“Nevertheless, our comprehension of early pterosaur evolution is constrained by significant temporal and anatomical gaps separating these highly adapted flying reptiles from their closest terrestrial relatives.”

“The fossil records for pterosaurs and their related species remain incomplete, and fundamental aspects of early evolution, including timing, domains of existence, initial radiation, and the ecological context of paleontology, are not well understood compared to other contemporary groups such as dinosaurs.”

The researchers concentrated on the distribution of two closely related groups: Pterosaurs and Lagerpetids.

“Lagerpetids existed roughly 240 million years ago as a group of agile reptiles that lived in smaller land areas and among trees,” they noted.

“These small terrestrial reptiles are now recognized as the closest relatives to pterosaurs, and this study shows they endured a wider range of climatic conditions than their aerial counterparts, including the arid landscapes of ancient Pangaea.”

“This adaptability resulted in a broader distribution of this group.”

“Conversely, pterosaurs seemed to be restricted to humid environments found in limited regions of the ancient world, as evidenced by fossils discovered in modern-day Italy, Austria, and the southwestern United States.

During the late Triassic period, global climatic conditions began to change, with an increase in warm and humid environments outside the equatorial region.

This shift provided an opportunity for flying reptiles to expand across the globe, including present-day high-latitude areas such as Greenland and South America.

“While dinosaurs roamed the Earth, I find it fascinating to envision that these formidable reptiles ruled the skies during that era,” remarked Dr. Foffa.

“However, the origins of pterosaurs remain cloaked in mystery. Our research contributes new insights into this puzzle, proposing that early evolution among groups was likely influenced by shifting climates and environments during the Triassic.”

“Climate change significantly affects biodiversity, both today and throughout geological history,” stated Dr. Emma Dunn, a paleontologist at Friedrich Alexander Universitat Erlangen Nurnberg.

“Recent advancements in modeling techniques have enabled paleontologists to better understand how climate change has shaped the biodiversity of significant fossil groups like pterosaurs in just the past few years.”

“The combination of ecological models and fossil data is emphasized by Dr. Alessandro Chiarenza, paleontologist at University College London, who noted:

“Lagerpetids flourished as generalists, while pterosaurs, initially constrained to a humid tropical niche with possibly limited flight capabilities, occupied equatorial territories.”

“As the climate transformed and forest corridors emerged, their wings propelled them to every corner of the planet, ultimately allowing them to survive one of Earth’s greatest extinctions.”

“What started as a tale of lost fossils is evolving into a paradigmatic example of how paleoclimate, past climate, and evolutionary innovations intertwine, illuminating the complex history that has fascinated paleontologists for over two centuries.”

Study published in the journal Natural Ecology and Evolution.

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D. Foffa et al. Paleobiogeography of climate drivers and lagerpetids and early pterosaurs. Nat Ecol Evol published online on June 18th, 2025. doi:10.1038/s41559-025-02767-8

Source: www.sci.news

Hubble Explores the Surface Conditions of Uranus’s Moons: Ariel, Umbriel, Titania, and Oberon

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A recent study by astronomers utilizing the NASA/ESA Hubble Space Telescope aimed to uncover signs of interaction between Uranus’ magnetic environment and the surfaces of its four largest moons: Ariel, Umbriel, Titania, and Oberon. The researchers predicted that, due to interactions with Uranus’ magnetosphere, the “leading” sides of these tidally locked moons should be brighter and more consistently illuminated compared to their “trailing” sides. This expectation stemmed from the belief that radiation darkening occurs on the trailing sides due to charged particles, such as electrons, captured in Uranus’ magnetosphere. However, their observations revealed no evidence of darkening on the trailing sides of the moons but found evident darkening on the leading side of the outer moon instead.

This web image displays Uranus alongside six of its 27 known moons (most of which are too small to be captured in this brief exposure). Image credits: NASA/ESA/CSA/STSCI/J. DEPASQUALE, STSCI.

Ariel, Umbriel, Titania, and Oberon are tidally locked, consistently presenting the same faces toward Uranus.

The hemisphere of the moon that faces the direction of its orbit is termed the leading hemisphere, while the side that turns away is the trailing hemisphere.

The initial hypothesis suggested that charged particles captured along the magnetic field lines would hit the trailing sides of each moon, leading to darkening of those hemispheres.

“They are working diligently to understand this phenomenon,” noted Dr. Richard Cartwright, a researcher affiliated with the Institute of Applied Physics at Johns Hopkins University.

“To start, Uranus has an axial tilt of 98 degrees relative to its orbit.”

“This significant tilt means Uranus is dramatically askew in relation to the planetary orbital plane. Completing its 84-year orbit, it rolls quite slowly around the sun.”

“Observations during the Voyager 2 flyby indicated that Uranus’ magnetosphere was tilted about 59 degrees from the satellite’s orbital plane, suggesting a further inclination in the magnetic field.”

Uranus’ magnetic field lines rotate more swiftly than the moons orbit the planet, resulting in the magnetic field lines continuously sweeping by the moons.

If the Uranus magnetosphere interacts with the moons, the charged particles should preferentially strike the surface of the leading side.

These charged particles and cosmic rays from our galaxy could potentially cause darkening effects on the trailing hemispheres of Ariel, Umbriel, Titania, and Oberon, which could lead to the presence of carbon dioxide detected on these moons.

Astronomers anticipated that the trailing hemispheres would show greater darkness compared to the leading ones, particularly for the inner moons, Ariel and Umbriel.

However, the findings contradicted this expectation, revealing that the leading and trailing hemispheres of both Ariel and Umbriel are quite similar in brightness.

Conversely, researchers noted observable differences in the outer moons, Titania and Oberon.

In an intriguing twist, the brightness variations were opposite to their hypotheses.

Both outer moons exhibit a darker, reddish leading hemisphere contrasted against their brighter trailing hemispheres.

The research team suspects that dust from Uranus’ irregular satellites coats the leading hemispheres of Titania and Oberon.

Irregular satellites are celestial bodies characterized by large, eccentric, and inclined orbits inrelation to their parent planet’s equatorial plane.

Constant impacts from micrometeorites on Uranus’ irregular satellites eject small particles into orbits around the planet.

Over millions of years, this particulate matter drifts inward towards Uranus, eventually crossing the orbits of Titania and Oberon.

These outer moons effectively collect this dust, particularly on their leading hemispheres.

It’s analogous to an insect striking the windshield of a car as it drives down the freeway.

This accumulated material results in Titania and Oberon exhibiting darker, reddish leading hemispheres.

These outer moons appear to shield Ariel and Umbriel from dust, resulting in no noticeable brightness differences for the inner moons.

“I believe a similar process occurs within the Saturn system and possibly the Jupiter system,” stated Dr. Brian Holler, an astronomer at the Institute of Space Telescope Science.

“This represents some of the first evidence we’ve gathered regarding material exchanges between Uranus’ moons.”

“It supports an alternative theory involving dust accumulation. I wasn’t initially inclined to accept this hypothesis, but the data often takes you by surprise,” Dr. Cartwright remarked.

These revelations lead scientists to suspect that Uranus’ magnetosphere may possess a more complex structure than previously assumed.

While there may be interactions between Uranus’ moons and its magnetosphere, they do not seem to yield the predicted asymmetries in the leading and trailing hemispheres, contrary to initial expectations.

Unraveling this mystery will necessitate further exploration into the enigmatic Uranus, its magnetosphere, and its moons.

This revised text maintains the original HTML structure while presenting the information in a different manner.

Source: www.sci.news

The Arid Conditions of Death Valley Could Be a Surprising Water Resource

Deserts like Death Valley can be an extraordinary source of drinking water

Mimi Ditchie Photography/Getty Images

The compact panels managed to extract a glass of clean water from the arid air of Death Valley, California.

Although the atmosphere over extremely dry regions can retain a significant amount of water, extracting it into usable supplies has proven challenging. Previous methods, including simple mesh fabrics and mist-capturing nets crafted from synthetic spider silk, have struggled to function effectively in real-world conditions.

Now, Xuanhe Zhao from the Massachusetts Institute of Technology and his team have created a unique water collector, about 0.5 meters tall and 0.1 meters wide. It features a glass panel embedded with absorbent hydrogels—gel-like substances formed from long polymer chains and lithium salts, enabling it to gather water molecules.

The hydrogel is designed to fold into an origami-like configuration, enhancing surface area to capture moisture during the night. The absorbed water evaporates when sunlight hits the glass panel the next day. The interior of the device is coated with a specialized cooling material, which collects the evaporated water as it condenses and drips into a storage compartment below.

Zhao and his team conducted a week-long test of the apparatus in Death Valley, where humidity can plummet to as low as 5%. In comparison, the annual average in London hovers around 70%. They discovered the device can harvest up to 160 milliliters of water each day, enough to fill a small glass.

It’s estimated that eight of these panels could meet the daily drinking water requirements of an average adult, making them especially beneficial in arid regions. “Given the compact design of the device, we believe larger arrays could provide drinking water to households for consumption,” says Zhao.

Zhao and his colleagues assert that while the device shows promise in real-world conditions, Daryl Williams from Imperial College London cautions that extended testing—beyond a week—could present challenges. “Outdoor environments are generally hostile. We want to observe how the device performs under such stress after three, six, or even nine months.”

topic:

Source: www.newscientist.com

Scientists create conditions resembling a “superpositioned” Schrodinger’s cat

The principle of quantum superposition allows the system to be prepared with two arbitrary state superpositions. A paradigmous example is the superposition of two coherent states. Superposition of such states is usually referred to as the Schrödinger cat state, but in Irwin Schrodinger’s original thought experiment, a cat-temperature-equal system system is prepared with superposition of two mixed states dominated by classical variation. Physicists at the University of Innsbruck have now managed to create the state of Hot Schrodinger cats with a superconducting microwave resonator.

Yang et al. We generated highly mixed quantum states with different quantum properties. Image credit: Innsbruck University.

SchrödingerCat states are an attractive phenomenon in quantum physics, where quantum objects exist simultaneously in two different states.

In Erwin Schrödinger’s thought experiment, it is a cat living and dead at the same time.

In real experiments, such simultaneity is seen in the positions of atoms and molecules, as well as the vibrations of electromagnetic resonators.

Previously, these analogues to Schrodinger’s thought experiments were first created by cooling quantum objects to their ground state.

In a new study, Dr. Gerhard Kirchumere and his colleagues at Innsbruck University demonstrated that it is indeed possible to create quantum superpositions from thermally excited states.

“Schrodinger also envisioned a living, namely “hot” cat in his thought experiments,” says Dr. Kirchumere, author of the study.

“We wanted to know if these quantum effects could also be produced if they didn’t start from the ‘cold’ ground state. ”

To generate the Schrödinger CAT state, researchers used a transmon Qubit with a microwave resonator.

They have succeeded in creating quantum layers at temperatures up to 1.8 k. This is 60 times the ambient temperature of the cavity.

“Our results show that it is possible to generate highly mixed quantum states with distinct quantum properties,” says Dr. Ian Yang, the first author of the study.

Scientists used two special protocols to create the state of Hot Schrodinger cats.

These protocols have been used previously to produce CAT states starting from the ground state of the system.

“It turns out that the tuned protocol also works at high temperatures and produces clear quantum interference,” said Professor Oriol Romero Isart, co-author of the study.

“This opens up new opportunities for the creation and use of quantum superpositions, for example, in nanomechanical oscillators.

“When I first mentioned our results, many of our colleagues were surprised because we usually think of temperature as a disruption to quantum effects,” says Thomas Agnius, co-author of the study.

“Our measurements confirm that quantum interference can last even at high temperatures.”

The findings could benefit quantum technology development.

“Our work reveals that quantum phenomena can be observed and used in warm, less ideal environments,” Dr. Kirchem said.

“If the system can create the interactions it needs, temperature is ultimately irrelevant.”

a paper The findings were published in the journal Advances in science.

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Ian Yang et al. 2025. Hot Schrodinger cat condition. Advances in science 11 (14); doi:10.1126/sciadv.adr4492

Source: www.sci.news

Planetist scientists offer fresh insights into the warm and wet conditions on ancient Mars

The team of the planetary researcher led by Caltech has decided on a chemical mechanism that can maintain sufficient warmth in the early days of ancient Mars, perhaps to host life.

Adams et al。 Mars has experienced a temporary warm period for the 40 million years of integration, estimating that each event lasted about 100 to 00 years. Image credit: M. Kornmesser / ESO / N. risinger, Skysurvey.org.

“Because Mars is far from the sun, it was a very puzzle that Mars had liquid water on Mars. Dr. Adams said.

“Hydrogen was previously theoretical as a magical component, mixed with carbon dioxide in Mars, causing an episode of greenhouse warming.”

“However, the life of air hydrogen was short, so a more detailed analysis was needed.”

In this study, Dr. Adams and his colleagues used photochemical modeling to describe the details of the relationship with hydrogen in the early atmosphere of Mars and how the relationship has changed over time.

“The early Mars is a lost world, but if you ask the right question, you can reconstruct in detail,” said Professor Robin Wordworth at Harvard University.

“In this study, we will integrate the atmosphere and climate of the atmosphere for the first time and bring some impressive new predictions that can be tested if you bring back Mars to Earth.”

The authors changed the model called dynamics to simulate how the combination of hydrogen and other gas, which responded to both the ground and air, reacted the early Mars climate.

They discovered that Mars has been a warm episode of about 40 million years, 400 million to 3 billion years ago during the Noatian and Hesperian days in Mars, and that each event lasted more than 10000 years.

These estimated values ​​match today's geological characteristics of Mars.

During the warm and damp period, the hydrogen of the crust or the lost water on the ground was driven, and sufficient hydrogen was supplied to accumulate in the atmosphere for millions of years.

During the fluctuations between the warm climate and the cold climate, the chemistry of the atmosphere of Mars also fluctuated. Carbon dioxide is constantly attacked by sunlight and is converted to carbon monoxide.

During the warm period, carbon dioxide can return to carbon dioxide and control carbon dioxide and hydrogen.

However, if it is long enough, the recycling decelerates, accumulates carbon monoxide, and reduces the reduction, that is, less oxygen.

Therefore, the red oxidation state of the atmosphere changed dramatically over time.

“We have identified all of these alternate time scale,” said Dr. Adams.

“And I explained all the same parts of the same photochemical model.”

Modeling work gives a potential new insight into the conditions for supporting the pre -buiotics chemistry (the basis of life after we know), and to the end of its life at intervals between cold and oxidation. Lends issues.

Researchers are working to find evidence of these alternatives using isotopic chemical modeling.

They will compare these results with the rocks of the Mars Sample Return Mission in the future.

Since Mars has no plate tectonics, unlike the earth, the surface seen today resembles the surface long ago, making the history of lakes and rivers more interesting.

“It will be a really wonderful case study for how the planet evolves over time,” said Dr. Adams.

study Published in the journal Natural global science

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D. Adams et al。 The warm climate of the early episode on Mars prepared by hydration of the crust. nut. GeosciReleased online on January 15, 2025. Doi: 10.1038/S41561-024-01626-8

Source: www.sci.news

Report: Climate change made conditions perfect for fueling California’s fire outbreak

summary

  • A new report states that the modern and dry winds that have been dried at high temperatures led to the fire in the Southern California have been about 35 % higher due to climate change.
  • The survey results are from a world meteorological group that analyzes the effects of global warming on extreme events.
  • The fire killed at least 29 people and destroyed more than 16,000 buildings.

The International Scientist Group has increased the extreme situation of climate change in the extreme situation that recent fires have made RO sounds in the Los Angeles area as a whole.

A strong state of dry winds at high temperatures ahead of the fire could have been about 35 % higher due to global warming caused by humans. New reports from the World Meteorological attribute groupWe analyze the effects of global warming on extreme events.

The fire, which began in the event of a fierce storm in the spring, killed at least 29 people, including houses, shops, and schools, as it had not been raining in the Great Los Angeles since spring.

“This was a perfect storm for the conditions of the fire disaster. From the viewpoint of the climate that enables the climate, the weather that drives the fire, and the huge environment from the place where these ignitions occurred.” Merced, who contributed to the report at the University of California, said at a press conference.

Compared to the time before the industrial revolution before fossil fuels were widely used, the Los Angeles area had a “dry season” on average every year, and the fire may match the seasonal Santaanana style. Is high. 。

Park Williams, a geographical professor at the University of Los Angeles, the University of California, said Park Williams in the cool season of Southern California. Unusually dry state; Ignition (almost always comes from people); and extreme weather like recent storms. He explained each of these conditions as an individual switch in a system that needs to be turned over all four to emit light.

“The artificial warming caused by climate change caused by humans makes light brighter,” said Williams.

The author in the report analyzes the weather and climate models to evaluate how the warm atmosphere changes the possibility of fire (it means a condition that increases the risk of mountain fire). They also tracked how metrics called the fire weather index changed over time. The index tracks all factors that contribute to temperature, relative humidity, wind speed, and fire.

Researchers have discovered that the types of conditions that promote the fire in the LA region are expected to occur once every 17 years in today's climate. Such a state would have been predicted once in 23 years without climate change, and it would not have been so extreme when they occurred.

Source: www.nbcnews.com

Laser Beams Can Create Shadows with the Proper Conditions

in new paper Published in today's magazine opticaphysicists explain how a laser beam casts a shadow that behaves like any other ordinary shadow.

Photographic image of the shadow of a laser beam. A high-powered green laser beam (object) passes through a ruby ​​cube and is illuminated from the side with blue light: (A) Photograph of the shadow cast by the object laser beam on a white piece of paper, imaged through a simple lens It will be magnified approximately 4 times using The length of the ruby ​​cube is approximately 1.2cm, and the enlarged image is approximately 4.8cm. Therefore, whether magnified or not, it depicts what can be seen directly. (B) Photographic image showing the surroundings for scale reference. Place a white plastic marker (i.e., a wide-tipped pen) in the path of the shadow between the object beam and the paper, and fix the camera focus on the (C) paper or (D) marker. The appearance of a shadow along the contours of the surface it falls on. All images were taken with a regular home digital camera in a dark room. Image credit: Abrahao others., doi: 10.1364/optica.534596.

“Laser light that casts shadows was previously thought to be impossible because light typically passes through other light without interacting,” said Dr. Rafael Abrahao, a researcher at Brookhaven National Laboratory. spoke.

“Demonstration of a highly counterintuitive optical effect prompts us to reconsider our concept of shadow.”

Dr. Abrahao and his colleagues used a ruby ​​crystal and a specific laser wavelength to show that laser beams can block light and create visible shadows through nonlinear optical processes.

This effect occurs when light interacts with a material in an intensity-dependent manner and can affect another light field.

“Our understanding of shadows has developed in close connection with our understanding of light and optics,” Dr. Abrahao said.

“This new discovery could prove useful in a variety of applications, including optical switching, devices in which one light controls the presence of another, or technologies that require precise control of light transmission, such as high-power lasers. There is a possibility that

In their experiment, the researchers shined a high-power green laser onto a cube made of a standard ruby ​​crystal, then shot a blue laser at it from the side.

When a green laser is incident on a ruby, it locally changes the material's response to blue wavelengths.

The green laser acts like a normal object, and the blue laser acts like a light.

The interaction between the two light sources creates a shadow on the screen, where the green laser appears as a dark area blocking the blue light.

It met all the criteria for a shadow, as it was visible to the naked eye, followed the contours of the surface it fell on, and followed the position and shape of the laser beam acting as the object.

The laser shadow effect is the result of ruby's optical nonlinear absorption.

This effect occurs because the green laser increases the light absorption of the blue illumination laser beam, creating a matching region within the illumination light with lower light intensity.

“This discovery expands our understanding of the interaction between light and matter and opens up new possibilities for harnessing light in previously unimagined ways,” Dr. Abrahao said.

The researchers experimentally measured that the shadow contrast depends on the power of the laser beam and found that the maximum contrast was about 22%, similar to the contrast of a tree's shadow on a sunny day.

They also developed a theoretical model and showed that it could accurately predict shadow contrast.

“From a technical point of view, the effect we demonstrated shows that the intensity of the transmitted laser beam can be controlled by firing another laser,” the scientists said.

“Next, we plan to investigate other materials and other laser wavelengths that can produce similar effects.”

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Raphael A. Abrahao others. 2024. Shadow of laser beam. optica 11 (11): 1549-1555;doi: 10.1364/optica.534596

Source: www.sci.news

Chemists show the existence of sulfurous acid in the gas phase in normal atmospheric conditions

Chemists at the Leibniz Institute for Tropospheric Research have discovered that sulfurous acid (H2So3), once formed in the gas phase, is kinetically stable enough to allow its characterization and subsequent reactions.

In the gas phase, sulfurous acid, once formed, exhibits some kinetic stability with a lifetime of at least 1 second in atmospheric water vapor conditions. Image courtesy of Berndt others., doi:10.1002/anie.202405572.

Sulfurous acid Having formula H2So3 The molecular weight is 82.075 g/mol.

This molecule, also known as sulfuric acid(IV) or thioic acid, is a difficult-to-reach acid that has never before been observed in aqueous solution.

However, sulfite Detected It was discovered in the gas phase in 1988 by dissociative ionization of diethyl sulfite.

“The only experimental detection of sulfurous acid to date was achieved in 1988 by the team of Helmut Schwarz at the Technical University of Berlin using in situ generation with a mass spectrometer,” said Dr. Torsten Berndt of the Leibniz Institute for Tropospheric Research and colleagues.

“Under vacuum conditions, we estimated an extremely short lifetime of more than 10 microseconds.”

“Theoretical calculations show that H2So3 As a possible reaction product of the gas-phase reaction of OH radicals with dimethyl sulfide (DMS), which are produced from ozone and water molecules in the troposphere primarily in the presence of ultraviolet light.”

“DMS is produced primarily by biological processes in the ocean and is the largest source of biogenic sulfur in the atmosphere, producing approximately 30 million tonnes per year.”

The researchers experimentally investigated possible reaction pathways to H.2So3 It starts with DMS.

Formation of H2So3 Its formation in the gas phase was clearly demonstrated in a flow reactor under atmospheric conditions.

“Under our experimental conditions, sulfurous acid remained stable for 30 seconds, regardless of humidity,” the researchers said.

“With the existing experimental setup, longer residence times have not yet been explored.”

“Therefore, H2So3 It may persist in the atmosphere long enough to affect chemical reactions.”

“The observed yields were somewhat higher than theoretically expected.”

According to related model simulations, about 8 million tons of H2So3 They form every year all over the world.

“In this pathway, the mass of H increases by about 200 times.2So3 Sulfuric acid (H2So4“It produces carbon dioxide (CO2) from dimethyl sulfide in the atmosphere,” said Dr Andreas Tilgner and Dr Eric Hofmann from the Leibniz Institute for Tropospheric Research.

“The new results may contribute to a better understanding of the atmospheric sulfur cycle.”

Team paper Published in the journal Applied Chemistry.

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Torsten Berndt others2024. Gas-phase production of sulfurous acid (H)2So3) floats in the atmosphere. Applied Chemistry 63(30):e202405572;doi:10.1002/anie.202405572

Source: www.sci.news

Snowball Earth’s harsh environmental conditions provided a competitive edge for the evolution of multicellular organisms

Fossil and molecular evidence suggests that complex multicellular organisms arose and proliferated during the Neoproterozoic Era (1-541 million years ago). An extreme glacial period during the Cryogenian Period (720-635 million years ago), an event commonly referred to as Snowball Earth, led to dramatic changes in Earth's climate and oceans. New research suggests that Snowball Earth was an environmental trigger for the proliferation of complex multicellularity across multiple groups of eukaryotic organisms.

Artist's impression of “Snowball Earth.” Image courtesy of NASA.

Solving the mystery of why multicellular organisms emerged could help pinpoint life on other planets and explain the enormous diversity and complexity seen on Earth today, from marine sponges to redwoods to human societies.

The prevailing thinking is that oxygen levels must reach a certain threshold for a single cell to form a multicellular colony.

However, the oxygen story does not fully explain why the multicellular ancestors of animals, plants and fungi emerged simultaneously, or why the transition to multicellularity took more than a billion years.

The new study shows how the specific physical conditions of Snowball Earth, particularly the viscosity of the oceans and the depletion of resources, may have led eukaryotes to become multicellular.

“It seems almost counterintuitive that these extremely harsh conditions – this frozen planet – could actually select for larger, more complex organisms, rather than causing species to become extinct or shrink in size,” said William Crockett, a doctoral student at MIT.

Using scaling theory, Crockett and his colleagues found that a hypothetical ancestor of early animals, reminiscent of swimming algae that fed on prey instead of photosynthesizing, would have grown in size and complexity under Snowball Earth pressures.

In contrast, single-celled organisms that move and feed by diffusion, such as bacteria, will grow small.

“The world changed after Snowball Earth because new life forms emerged on the planet,” said Professor Christopher Kemps of the Santa Fe Institute.

“One of the central questions of evolution is: How did we evolve from nothing on Earth to beings and societies like us? Was it all by chance?”

“We don't think it's luck. There are ways to predict these big changes.”

The study shows how, during the Snowball Earth era, the oceans froze, blocking sunlight and reducing photosynthesis, which resulted in nutrient depletion in the oceans.

Larger organisms that could process more water were more likely to eat enough to survive.

As the glaciers melt, these large creatures could expand even further.

“Our study provides hypotheses about ancestral features to look for in the fossil record,” Crockett said.

of study Published in Proceedings of the Royal Society B.

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William W. Crockett others2024. Snowball Earth's physical constraints drive the evolution of multicellularity. Proc. R. Soc. B 291 (2025): 20232767; doi: 10.1098/rspb.2023.2767

This article is a version of a press release provided by the Santa Fe Institute.

Source: www.sci.news

The impact of climate change on food costs: A prediction of rising prices and worsening conditions

Food prices are on the rise

AFP (via Getty Images)

Because of global warming, you are already paying more and more for groceries. And rising temperatures will cause food prices to rise significantly over the next decade.

By 2035, rising temperatures alone are expected to increase global food prices by 0.9 to 3.2 percent each year, according to a study conducted in collaboration with the European Central Bank. This would increase the overall inflation rate by 0.3 to 1.2 percentage points.

“We are often shocked and surprised by the magnitude of these effects,” he says. Maximilian Kotz He mentioned discussions he had with economists during his research at Germany's Potsdam Institute for Climate Impact Research.

Abnormal weather due to global warming Increasingly impacting food production around the world And if farmers don't adapt, the losses will become even more severe as the world continues to warm.

To find out how this is affecting food prices, Kotz and his colleagues looked at monthly price data for a variety of goods and services for 121 countries from 1996 to 2021 and the exposure to which those countries were exposed. The weather conditions were compared.

Researchers looked at the correlation between food prices and factors such as average monthly temperatures, temperature fluctuations, droughts and extreme rainfall. They found a strong association between average temperature and food prices a month or so later.

Areas north of 40 degrees latitude, such as New York City, Madrid, and Beijing, experienced warmer-than-average winter temperatures, leading to lower food prices. But not just in the summer, temperatures in other parts of the world have always been above average, causing food prices to rise.

Moreover, the impact on prices is long-lasting. “If prices go up based on one of these shocks, they stay high for at least the rest of the period,” Kotz says.

The study didn't look at why prices have increased, but one possible explanation is that extreme heat is reducing yields, he said. “The vines may be dry when the crop should be harvested.”

Kotz said factors such as extreme rainfall had a smaller impact on food prices than average temperatures. This may be because flooding tends to be localized, whereas above-average temperatures can be very widespread.

Other studies have reached similar conclusions, Kotz said. But his team went a step further and investigated how food prices would change based on increases in average temperatures in climate model projections. Under the team's worst-case emissions scenario, global food inflation due to climate change will exceed 4% per year by 2060. However, the team believes the 2035 prediction is more reliable, as many other factors could have changed by then.

“There are a lot of things that could happen that will change the way the economy responds to climate change,” Kotz said. For example, inflationary pressures would be reduced if farmers adapted their practices to better cope with rising temperatures. But so far, he says, there is no sign that farmers are adapting.

“I think these are realistic predictions. They are based on solid empirical evidence.” Matin Kaim At the University of Bonn, Germany. “We need to recognize the fact that climate change poses new and major challenges to food and nutrition security.”

according to Food Price Index of the Food and Agriculture Organization of the United Nations, The cost of food fell in real terms between 1960 and 2000, but has risen since then. Russia’s invasion of Ukraine in 2022 caused a massive surge – factors that influence this Protests are occurring in many countries. The index price has since fallen, but remains higher than before the invasion.

Like the US Federal Reserve and the Bank of England, the European Central Bank aims to: keep inflation around 2%. Rising food inflation will make achieving this goal even more difficult, Kotz said.

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Source: www.newscientist.com

Early Earth conditions could have supported the production of essential life chemicals

Chemical reactions in volcanic pools may have contributed to the birth of life on Earth

Michael S. Nolan/Alamy

One of the most important molecules in living organisms is synthesized from scratch under everyday conditions. The discovery suggests that this chemical formed naturally early in Earth's history and may have played a role in the origin of life.

The substance in question is called pantetheine. It is not a well-known name at the DNA or protein level. However, pantetheine is an important component of a larger molecule called pantetheine. acetyl coenzyme A, A “cofactor” that helps enzymes work.

“Coenzyme A is present in every organism ever sequenced,” he says. Matthew Powner At University College London.

Powner has spent most of his career discovering ways to make biomolecules from simple chemicals in a way that can occur naturally. Over the past decade, he has shown that: aminonitrile can be used to make nucleotide – the building blocks of DNA – and peptide, Short version of protein.

His team has now shown that aminonitrile can be used to make pantetheine in a series of reactions starting with simple chemicals like formaldehyde. This was done in water, often at such dilute concentrations that the reaction mixture appeared like clear water. The team sometimes used heat to speed up their work, but otherwise did not need to intervene once the reaction started.

“We just put everything in one pot. We literally just throw everything in, we don't change anything, we don't do anything, and we have a 60% yield of product,” Powner says.

Acetyl coenzyme A is involved in the synthesis of several biologically important chemicals. Some of the oldest microbial groups use processes involving microorganisms to obtain carbon from the environment.

Importantly, pantetheine is the active portion of the acetyl-coenzyme A molecule. No more than one bit is “essential to its functionality,” Powner says.

This type of cofactor is present in all living organisms.They are described as follows Origin of life and remnants of early evolution.

“Obtaining key organic biological cofactors from scratch,” he says, is impressive, “not to mention one of such centrally important ones.” Zachary Adam from the University of Wisconsin-Madison was not involved in the study.

For Adam, the importance of this research extends beyond pantetheine and acetyl coenzyme A. “They report this particular part of the cofactor, but intermediates have been shown to be important as well,” he says. Other chemicals produced in the process have been shown to aid in the production of other biomolecules. “They're building a network of compounds.”

Many ideas about the origin of life have assumed that a small set of biomolecules formed long before other molecules. For example, the “RNA world” hypothesis states that first life was made solely of RNA, and other chemicals such as proteins and lipids were added after RNA was able to make them. .

Powner is one of several researchers pushing for an alternative scenario in which many important molecules form early and interact from the beginning. “These products can all be products of the same chemical reaction,” he says. Rather than starting with just RNA, or just peptides, “it might be easier to make them all together, so the chemical reactions they perform are integrated from the original state.”

topic:

  • chemistry /
  • origin of life

Source: www.newscientist.com

CRISPR gene therapy shows promise in treating severe inflammatory conditions

New treatment cuts the gene for kallikrein, a protein involved in inflammation (illustrated)

BIOSYM TECHNOLOGIES, INC./Science Photo Library

Nine people with a rare genetic disease that causes a life-threatening inflammatory response appear to have been cured after taking part in the first trial of a new version of CRISPR-based gene therapy.

This condition, called hereditary angioedema, causes sudden swelling of tissue that affects parts of the body such as the face and throat, similar to aspects of an allergic reaction, but cannot be treated with anti-allergy drugs.

Ten people who received a one-time gene therapy administered directly into the body saw a 95 per cent reduction in the number of 'swelling attacks' in the first six months after the treatment took effect. . Since then, all but one have had no further seizures for at least a year, although one patient who received the lowest dose had one mild seizure. “This is potentially a cure,” he says Padmalal Gurugama At Cambridge University Hospital in the UK, we worked on a new approach.

Hereditary angioedema is usually caused by mutations in the gene that encodes a protein called C1 inhibitor, which is involved in suppressing inflammation, which is part of the immune response.

People with this condition may experience a sudden buildup of fluid under their skin several times a month, which is painful and can cause suffocation if it gets stuck in the throat. This attack can be caused by a virus, changes in hormone levels, or stress.

Existing drugs that can reverse attacks work by blocking another molecule involved in inflammation called kallikrein, which is made in the liver. Because people can be born without the ability to make kallikrein without adverse effects, the results suggest that it is safe to permanently block kallikrein through gene therapy, Gurgama said.

The new treatment, developed by a company called Intellia Therapeutics in Cambridge, Massachusetts, consists of genetic material designed to cut the kallikrein gene. It is encapsulated in lipid nanoparticles and taken up by liver cells. One person was treated in the UK and nine in New Zealand and the Netherlands.

An unusual feature of this therapy is that it is administered directly to humans, a method also referred to as “in vivo” delivery. “They get one infusion and that's it,” he says. julian gilmore from University College London was not involved in the study. “It's very appealing.”

So far, most other CRISPR-based gene therapies have been administered “outside the body.” This means a more complex and time-consuming procedure of taking some of a person's cells outside the body, changing the cells in a lab, and then reinjecting them.

CRISPR gene therapy is being developed for multiple genetic diseases, with the first treatments recently approved in the UK and US to help patients with two forms of genetic anemia: sickle cell disease and beta-thalassemia. Ta.

The success of the latest trial is “very exciting,” Gilmore said. Development of CRISPR-based treatments for people with various liver-related conditions, called transthyretin amyloidosis. “This technology could be applied to any disease caused by a mutant protein produced exclusively in the liver, where it is desirable to knock down that protein,” he says.

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Source: www.newscientist.com

Scientists have made a breakthrough in understanding how tardigrades are able to survive in extreme conditions

Tardigrade observed using a fluorescence microscope.Some organs are highlighted with fluorescent markers

Smythers et al/PLoS ONE (CC-BY 4.0)

Tardigrades are known for their ability to withstand extreme environments, and we now know how they do this. Small molecular sensors inside cells can detect when harmful molecules called free radicals are produced in excess, causing a state of dormancy.

Tardigrades, also known as tardigrades, are eight-legged microscopic invertebrates found throughout the world. Under adverse conditions such as sub-zero temperatures and strong radiation, the creatures shrink into a dry ball called a tongue and enter a deep hibernation state.

“Tardigrades do not breed under extreme conditions, but they can overwinter.” Derrick Colling At Marshall University in West Virginia. “We wanted to understand how they could step in there.”

To study, Kolling and colleagues exposed tardigrades to high levels of hydrogen peroxide, sugar, salt, or temperatures of -80°C (-112°F) to induce Tun. As a result of these stresses, tardigrades produce harmful, highly reactive molecules called oxygen free radicals.

The free radicals then go on to react with other molecules, team members say. leslie hix At the University of North Carolina at Chapel Hill. Importantly, the research team discovered that free radicals oxidize an amino acid called cysteine, which is one of the building blocks of proteins in the body. These reactions change protein structure and function and signal the onset of quiescence.

In experiments where cysteine ​​oxidation was prevented, tardigrades were unable to enter the tun state. “Cysteine acts like a kind of regulatory sensor,” Hicks says. “This allows the tardigrade to sense its environment and respond to stress.”

When conditions improved, the researchers discovered that the cysteine ​​was no longer oxidized and instructed the tardigrades to wake up from the tongue.

“Whether this is a universally conserved protection mechanism and whether this is conserved across tardigrade species is a really important question,” Hicks says. Her answers, she says, could help us better understand the aging process and how to make long-term space travel a reality.

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Source: www.newscientist.com

Possums in Australia are struggling with extreme heat conditions

A quoll searches for termites in a fallen log.Poor night vision is also part of the reason they have to forage for food in the heat of the day.

kristin cooper

As Australia's temperatures continue to get hotter, the specialized fur that possums evolved to save energy is now putting them at risk of overheating.

possum (Myrmecobius fasciatus) is an unusual marsupial in that it is active during the day, feeding on termites hidden under tree logs and topsoil. Because these insects are low-calorie foods, possums, which typically weigh about 500 grams, have evolved fur that absorbs heat from the sun, saving calories spent on generating body heat.

As temperatures rise, that evolutionary trait can backfire, causing possums to overheat within minutes of feeding in direct sunlight. kristin cooper at Curtin University, Perth, Australia.

Quolls once roamed southern Australia, but over the past two centuries they have fallen prey to cats and foxes introduced by European settlers. Currently, these endangered animals are concentrated in just two small nature reserves in Western Australia.

To increase their numbers, conservation groups are gradually moving the marsupials to areas protected from their native predators. But global warming is making some of these regions even hotter and drier.

“Environmental change is occurring at an unprecedented rate due to anthropogenic global warming, which means that predicting future species distribution and population patterns, protecting and managing them requires environmental conditions “This means it is important to understand the ecological consequences of changes in philip withers researchers from the University of Western Australia write in a paper.

To learn more, the pair used a thermal imaging camera to film 50 wild animals eating termites at different times of the day from 2020 to 2021.

At each site, portable weather stations were used to record factors such as temperature, wind speed, and humidity. They then incorporated this data into a computer program to model how environmental conditions affected the quolls' internal temperatures.

The researchers found that on days of high heat stress, such as in dry environments with temperatures of 40 degrees Celsius, possums overheat within 10 minutes of exposure to direct sunlight. After that, they need to stop eating and hide from the sun until their body temperature drops.

Shade is helpful, but shade is often scarce, and seeking shade limits the termite-hunting territory of possums, Cooper says. The model also suggests that the combination of high outdoor temperatures and radiant heat from the ground can cause possums to overheat even in the shade.

Feeding at night is not an option for possums, as they have poor night vision and lack the strength to invade termite mounds at night.

To overcome these problems, Cooper recommends conservation groups move quolls to cooler areas of their territory and provide plenty of shade.

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Source: www.newscientist.com

Expecting an Increase in IT Budgets in 2024, Though Startups May Face Tough Conditions

I think most People would agree that 2023 was a difficult time for startups. Many layoffs occurred as companies struggled to move from growth to profitability. On the other hand, sales cycles were becoming longer and many startups were struggling to grow at a decent pace.

As we start to see that the economic indicators are starting to improve a little bit.
calming inflation,
cost of money You might think 2024 might be a better year if currencies weaken and headwinds for most currencies subside.

necessarily.

We’re entering a new era, one in which money won’t flow as freely, and according to the experts we spoke to, it won’t be coming back anytime soon. This means startups that don’t have enough capital now may continue to struggle in 2024, and flipping the calendar won’t change that.

What does that mean for startups heading into 2024? It means they need to prove their worth more than ever. This means you need enough cash to survive long sales cycles. That means he will have to fight for a piece of the corporate budget, and perhaps 2024 could be a year much like his 2023.

Budget outlook

A good starting point for budget discussions is what the proposed budget looks like. Analyst firms like IDC and Gartner forecast IT spending each year, but they typically adjust throughout the year as reality becomes clearer.

IDC predicts growth of 6.8%, up from 5% last year. This figure covers hardware, software, and services, but excludes communications spending. Gartner, on the other hand, predicts a slightly higher rate of 8.2%.

The overall upward trend should be good news for startups looking to corporate buyers to lift their business. But his Gartner analyst John-David Lovelock, who tracks IT budgets, says that while 2023 was a year of increased efficiency, it won’t just end in the new year.

Source: techcrunch.com

The ISS Crew Stay Busy While Waiting for SpaceX’s Dragon to Navigate through Weather Conditions


This night view of southern Europe looks from Milan, Italy, northwest to southeast (bottom right), across the Adriatic Sea to Split, Croatia. At the time this photo was taken, the International Space Station was orbiting 423 miles above eastern France.
Credit: NASAExpedition 70 crews continue to pack up the U.S. cargo spacecraft for departure early next week. The seven residents living on the ship are international space station (ISS) has also explored virtual reality while providing various scientific and life support hardware services.
NASA and space x The undocking of the SpaceX Dragon cargo replenishment spacecraft from the International Space Station will be postponed to Sunday, Dec. 17, due to inclement weather as a cold front moves through the spray belt off the coast of Florida.The joint team will continue to assess weather conditions to determine the best opportunity for Dragon to autonomously leave the space station and determine the next available opportunity by 5:05 p.m. EST Monday, December 18th.The vibrant city lights of Tokyo were captured from the International Space Station, orbiting 421 miles above the sky.
Credit: NASAWeather permitting for Monday’s undock, coverage of Dragon’s departure will begin at 4:45 p.m. on the NASA streaming service. web or NASA app. The coverage will also be broadcast live on NASA Television. YouTubeand the agency’s Website. After re-entering the atmosphere, the spacecraft will fly off the coast of Florida, but the event will not be broadcast on NASA TV.
NASA astronaut Jasmine Moghbeli and NASA’s Satoshi Furukawa JAXA The Japan Aerospace Exploration Agency (Japan Aerospace Exploration Agency) has resumed transferring cargo freezers packed with science from the station’s Express Rack to Dragon. The two activated and configured the scientific freezer within the Dragon, securing biological samples stored for recovery and analysis on Earth.
Prior to this, Moghbeli replaced hardware in the Solution Crystallization Observation Facility, a research instrument that studies crystal morphology and growth. She also shook up mixing tubes containing seed samples for astrobotany research. Furukawa reconnected the power and communications units within the combustion research hardware in Kibo’s laboratory module.
Palm Jumeirah, an artificial island shaped like a palm tree, is a highlight of the city of Dubai in the United Arab Emirates in this nighttime photo taken from the International Space Station, which orbits 454 miles above the Persian Gulf. Masu.
Credit: NASAESA Commander Andreas Mogensen (european space agency) His day began with an experiment aimed at strengthening computer programming skills Promote STEM careers for students across the globe. Mogensen then donned virtual reality goggles and watched a 360-degree film to understand the stabilizing effects of the nervous system. VR mental care experiment.
NASA flight engineer Loral O’Hara spent the day performing laboratory maintenance throughout the orbiting outpost. She replaced orbital plumbing components, deployed a portable her fan inside the Tranquility module, and replaced a broken wireless antenna inside the Unity module.
The space station’s three astronauts remained focused on scientific activities and maintaining the orbital system. After breakfast, flight engineers Oleg Kononenko and Nikolai Chubb scanned the stomach again with an ultrasound machine. Roscosmos Research on spatial digestion. Mr. Kononenko relocated the eggs into incubators for biological experiments, and Mr. Chubb transferred the dismantled life support equipment from the Zarya module to Unity. Flight engineer Konstantin Borisov spent the morning working on the orbital plumbing and ended the day by photographing and inspecting the windows of the Zvezda service module.

Source: scitechdaily.com