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Climate Change Significantly Contributed to the Extinction of Homo floresiensis

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Homo floresiensis A recent study indicates that Liang Bua, the cave where this diminutive hominin species resided for approximately 140,000 years, was deserted during a significant drought between 61,000 and 55,000 years ago.

Reconstruction of Homo floresiensis. Image credit: Elizabeth Danes.

Homo floresiensis was first identified in 2003 in Liang Bua, Flores Island, Indonesia.

This species, often referred to as hobbits due to their small size, challenged prevailing theories regarding human evolution.

It vanished from the fossil record around 50,000 years ago, but the reasons for its disappearance are still unclear.

“In 2003, excavations in the Liangbua rock trench unveiled the skeletons of a previously unknown small hominid species, Homo floresiensis,” stated Emeritus Professor Mike Gagan and colleagues from the University of Wollongong.

“Originally, the period of occupation was estimated to be between 95,000 and 12,000 years ago, suggesting the possibility of interaction with early modern humans (Homo sapiens), who inhabited islands in Southeast Asia and were contributing to species extinctions.”

“However, following a revision of the stratigraphy and chronology at this site, all Homo floresiensis human bones are now believed to be approximately 100,000 to 60,000 years old.”

“Associated stone artifacts and megafaunal assemblages typically suggest that Homo floresiensis went extinct around 50,000 years ago.”

“The revised timeline indicates they disappeared from the record around 46,000 years ago, coinciding with the arrival of modern humans at Liang Bua, and there was a significant shift in the types of materials used for making stone tools.”

In the study, the authors integrated chemical records from cave stalagmites with isotope data from the fossilized teeth of a pygmy elephant species, Stegodon florensis insularis, which Homo floresiensis hunted.

The findings reveal a large-scale drying trend that commenced around 76,000 years ago and peaked in severe droughts between 61,000 and 55,000 years ago, near the time when the species went extinct.

Prolonged drought and heightened competition for resources may have led to their abandonment of Liang Bua and, ultimately, their extinction.

“At that time, the ecosystem surrounding Liang Bua experienced significant drying. Homo floresiensis vanished,” remarked the lead author of the study, Emeritus Professor Mike Gagan from the University of Wollongong.

“The summer rains caused the riverbed to become dry seasonally, placing stress on both the hobbits and their prey.”

The population of pygmy elephants saw a drastic decline around 61,000 years ago, signaling the loss of a crucial food source for the hobbits.

“Surface freshwater, along with Stegodon and Homo floresiensis, all diminished simultaneously, showcasing the compounded effects of ecological stress,” stated Dr. Gerd van den Bergh from the University of Wollongong.

“Competition for the scarce water and food likely forced the hobbits to vacate Liang Bua.”

“Meanwhile, the fossils of Homo floresiensis predate the earliest evidence of modern humans on Flores, Homo sapiens, who were traversing the Indonesian archipelago when the hobbits went extinct.”

“It’s possible that the hobbits encountered modern humans while migrating in search of water and food,” Professor Gagan noted.

“In that context, climate change may have set the stage for their eventual extinction.”

The study was published in the journal Communication Earth and Environment.

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MK Gagan et al. 2025. The onset of summer dryness and forest decline of Homo floresiensis at Liang Bua 61,000 years ago. Communication Earth and Environment 6,992; doi: 10.1038/s43247-025-02961-3

Source: www.sci.news

Research Suggests Invasive Polynesian Rat Contributed Significantly to Easter Island Deforestation

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The ecological shifts experienced on Easter Island (Rapanui) represent one of the most illustrative yet contentious examples in environmental archaeology. This discussion centers around the Polynesian rat (brown rat) amid the island’s deforestation, an event that wiped out an estimated 15 million to 19.7 million palm trees, specifically the palm tree (pashalococcos disperta) between approximately 1200 and 1650 AD.

Easter Island, known as Rapa Nui to its early inhabitants, is one of the least populated islands in the world. It is located approximately 3,512 km from the west coast of Chile and about 2,075 km west of the nearest inhabited island, Pitcairn Island. For reasons still unclear, the early Rapa Nui people began carving giant statues from volcanic rock. These monumental statues, known as moai, are among the most remarkable ancient artifacts discovered. Image credit: Bjørn Christian Tørrissen / CC BY-SA 3.0.

Prior to human settlement, Rapa Nui was dominated by large palm trees of now-extinct varieties, including the Chilean wine palm (Jubaea chillensis).

These majestic trees can survive for up to 500 years, but are slow-growing, taking around 70 years to mature and bear fruit.

By the time Europeans arrived in 1722, very few palm trees remained. When European interest in the island’s ecosystem peaked, these trees had largely disappeared.

“European accounts often describe islands devoid of trees, yet they also mention palm trees and their fronds,” notes Carl Lipo, a professor at Binghamton University.

“It’s uncertain whether they used this term to denote other types of trees.”

When exploring new islands, Polynesians transported various subsistence items such as taro, sweet potatoes, bananas, yams, dogs, chickens, and pigs, along with the omnipresent Polynesian rat.

In contrast to the Norway rat (brown rat), which was introduced post-European contact and favors the tree canopy, this smaller arboreal species provides a wealth of information for researchers.

“Their genetics showcase unique haplotypes due to the ‘founder effect’,” explains Professor Lipo.

“The genetic diversity of rats as they traverse the Pacific allows us to trace human migrations and the frequency of these settlements.”

The methods by which these rats entered Polynesian outrigger canoes is debated. Were they stowaways or intentionally included as a backup food source? Ethnographic evidence leans toward the latter.

“After European arrival, a naturalist collecting specimens for the British Museum witnessed a man walking with a mouse, who informed him it was for lunch.”

Additionally, rat bones have been uncovered in midden deposits, or ancient refuse piles, on various Pacific islands.

Upon their arrival at Rapa Nui around 1200 AD, the rats discovered a predator-free paradise filled with their preferred foods.

Their population surged into the millions within a few years, as they can breed multiple times annually.

“The palm fruit was like candy to the rats. They turned into a significant food source,” Professor Lipo commented.

Rapa Nui’s palm trees had coevolved with birds and did not develop the boom-and-bust production cycle that would have enabled some nuts to withstand rodent exploitation.

As a result, rats consumed the palm fruit, preventing the next generation of trees from establishing.

Simultaneously, humans cleared land for sweet potato fields. This dual pressure led to the deforestation now characteristic of the island.

Alongside plants and animals, Polynesians also incorporated practices such as slash-and-burn agriculture to enhance soil fertility.

Old volcanic islands like Rapa Nui possess poor soil, and rainfall depletes nutrients.

Clearing or burning parts of the forest temporarily rejuvenates soil quality.

Once nutrients are exhausted, farmers relocate, the land recuperates, and trees regrow.

“This pattern is also observable in New Guinea and other regions across the Pacific,” Professor Lipo mentions.

“However, in Rapa Nui, the slow growth of trees and the rats consuming coconuts inhibited regrowth.”

Eventually, the islanders shifted to a farming technique that utilized stone mulch to enrich their crops.

While the reduction of palm forests marked a significant ecological transformation, it was not a disaster solely orchestrated by humans.

The islanders’ survival did not hinge on the palm trees; rather, it depended on the availability of cleared land for agriculture.

Moreover, palms are not hardwoods; they belong to the grass family and do not provide material for canoes, homes, or fuel.

“The loss of palm forests is unfortunate, yet it wasn’t catastrophic for the people,” states Professor Lipo.

“They didn’t rely on them for survival.”

Though some palms may have persisted into European colonization, the introduction of sheep farming in the 19th century likely sealed their extinction, as any remaining seedlings would be consumed by sheep.

Ironically, the Polynesian mouse suffered a similar fate to the palm trees, being outcompeted by Norway rats or predated by non-native species like hawks on most islands.

Despite changes in species, islanders still discuss the rodents’ cyclical population booms and severe declines.

The narrative of Rapa Nui exemplifies unintended consequences as well as resilience and adaptability in one of the most remote inhabited islands, with its closest neighbor situated 1,931 km (1,200 miles) away.

“A more nuanced perspective on environmental change is essential,” says Professor Lipo.

“We are integral to the natural world and often modify it for our benefit; however, this does not necessarily imply we are creating an unsustainable environment.”

Findings from this study will be published in the archeology journal.

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Terry L. Hunt and Carl P. Lipo. 2025. Re-evaluating the role of Polynesian rats (brown rat) in the deforestation of Rapa Nui (Easter Island): Faunal evidence and ecological modeling. archeology journal 184: 106388; doi: 10.1016/j.jas.2025.106388

Source: www.sci.news

What Factors Contributed to Solar Power Being the World’s Most Coveted Energy Source?

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“Today’s solar panels will inevitably reach the end of their lives and will require recycling or disposal.”

Jacques Hugo/Getty Images

By the mid-2020s, solar energy had become a major player. It emerged as the most affordable form of power generation and was also one of the fastest-growing sources of energy. The lifespan of solar panels had extended significantly, lasting around 30 to 40 years. However, eventually, these panels would need to be recycled or disposed of. By 2050, predictions indicated that there could be as much as 160 million tonnes of solar module waste. While this amount was considerably less than that produced by fossil fuel sources, it still posed a challenge.

Researchers began exploring how to create self-healing and even self-organizing solar panels.

By the mid-2030s, advancements had led to the creation of live solar panels, also known as biological solar power generation (BPV), which were deployed globally. The aesthetically pleasing, natural look of this technology made it popular, leading to the mantra of “yes, in my backyard,” and rapid adoption of living sunlight technology.

One of the first benefits was easily observed in off-grid rural areas, particularly in sub-Saharan Africa, where BPVs provided energy for mobile phones and computers without the need for batteries. As the technology progressed, older buildings were revamped into BPVs resembling green walls and roofs, while new structures incorporated living solar panels right from the design phase, allowing more people to become less dependent on traditional grid energy. This also helped boost local biodiversity and enhance overall happiness.

BPV operates like a fuel cell, where electrons move from the cathode to the anode, generating electricity. In biological contexts, electrons are produced by photosynthetic organisms and subsequently transferred to the anode.

Back in 2011, scientists became intrigued by the phenomenon of electrical leakage from cyanobacteria in sunlight. They discovered that by placing cyanobacteria on electrodes, they could harvest current to power small electronic devices.

However, the electrical output was weak due to insufficient electron leakage from the bacteria. Scientists like Chris Howe from Cambridge University worked on genetically modifying cyanobacteria to enhance electron leakage, allowing them to be connected to electronic devices.

In 2022, Howe’s team found that they could power computers solely using photosynthesis. Soon after, scientists made significant strides in their ability to scale up current harvesting and develop devices powered by biological energy sources worldwide.

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Members of Homo Photosyntheticus pledged to limit their electricity consumption strictly to that derived from photosynthesis.
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One immediate benefit was a significant decrease in demand for small batteries that power many devices. By 2025, these batteries accounted for 3% of the global battery market, resulting in 10,000 tonnes of waste each year.

With the improvement in BPV technology, larger devices like mobile phones and refrigerators began operating on batteries charged by living solar cells. Electric vehicles could be charged using arrays of biological solar panels installed in garages and depots, leading to a reduced need for metals like lithium and manganese.

Remarkably, the devices continued to function in low light. At night, the cells metabolized compounds created during the day, producing a comparable amount of electrons to maintain power.

The rise of living solar technology had numerous implications. As buildings adopted a green aesthetic, urban planners started integrating more nature into streets and public areas. Even densely populated cities began to exhibit a vibrant green atmosphere, teeming with trees, plants, flowers, and wildlife.

The success of BPVs inspired a movement focused on integrating the organelles of plant cells responsible for photosynthesis. This enthusiastic group, identifying as members of Homo Photosyntheticus, drew inspiration from solar-powered sea slugs and incorporated chloroplasts sourced from plant leaves into their own biology.

Sea slugs have evolved methods to sustain and manage chloroplast functionality; however, they sometimes require additional chloroplasts. They possess a leaf-like structure that maximizes surface area, yet the energy obtained through photosynthesis only meets a small fraction of their energy requirements. For humans, without the cellular infrastructure to support chloroplast function or leaf-like shapes, this method could only yield negligible energy.

Nevertheless, for self-identified members of H. Photosyntheticus, the incorporation of chloroplasts held significant symbolic meaning. They engaged in what they referred to as “greening,” committing to utilize only electricity generated directly through photosynthesis—eschewing fossil fuels altogether! Additionally, they commonly tattooed chloroplasts on their skin as a visible testament to their dedication.

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Source: www.newscientist.com

Canada’s Major Wildfires Contributed to Global Cooling in 2023

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A wildfire in British Columbia, Canada, blazes in June 2023

Imago/Alamy stock photos

2023 set new records as one of the hottest years, but it could have been even warmer. Climate models indicate that without the cooling effect of smoke from large wildfires in Canada, the average summer temperature in the Northern Hemisphere would have been approximately 1°C higher. Smoke may also be present in August, India’s driest month.

“It’s difficult to grasp the scale of such a massive fire. It was extraordinary,” remarks Iurian Allyn Roz from the Crete Institute of Technology in Greece.

According to Rosu, emissions from wildfires this year were estimated to be five to six times higher than those recorded during previous wildfire seasons in Canada. Although carbon dioxide from these fires contributes to warming, in 2023, this warming was offset by the cooling effects of the smoke blocking sunlight.

To quantify the smoke’s cooling impact, Ross and colleagues conducted a series of climate model simulations, comparing scenarios with and without emissions from Canadian wildfires. The findings suggest that between May and September, smoke caused local cooling up to 5.4°C (9.7°F) in certain areas of Canada, leading to an overall cooling of 0.9°C (1.6°F) for the Northern Hemisphere.

This might be unexpected given that record temperatures were reported in parts of Canada that summer. However, while the heat was mostly concentrated in the west, Ross explains that the smoke drifted eastward, where it had the most significant cooling effect.

The effects extended beyond Canada as well. In this model, emissions from wildfires altered wind patterns in Asia, diminishing the monsoon and reducing rainfall in India. This aligns with actual observed phenomena.

“The precipitation discrepancies observed in the data closely resemble those predicted in the model,” notes Rosu, affirming the model’s accuracy.

Nonetheless, the cooling effect proved to be short-lived. “Data analysis for November and December showed minimal impact,” says Rosu.

The record for the hottest year of 2023 may not last long, as 2024 is shaping up to be even hotter.

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Source: www.newscientist.com

How Virtual Reality Goggles Contributed to my Journey to Physical Rehabilitation

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IYou were asking me a month or two ago if I had ever had a spatially immersive experience, or if I was 60 years old and could have been hired early. Virtual Reality Goggles, I’d say it was as likely as the Silicon Valley tech giant appointed to “disrupt” the US federal government.

Let me explain a series of events that are likely to have led me to the latest technology.

Over the years I had to be in the perfect acrobatic position that would qualify me Cirque du Soleil To avoid discomfort while working on my computer. Despite moving to multiple rounds of standing desk and boring physics, I can no longer use my right arm.

Last year in particular felt like a tortured battle between cognitive decline and brain fog. This is the result of the steady use of ineffective anti-inflammatory agents. I have never done much work in my life and never had much time in my hands. I am currently armed with an MRI scan indicating that my shoulder tendon has ruptured. This records the date to combat the three herniated neck discs compressing the nerves running through my arm, and my malicious guilt.

To cope, I have learned to develop curiosity, a great source of distraction. I leave the house and open to places where adventures may take me… because you never know. Last week I did a shuffle dance with a great DJ Camden assembly Pub in the afternoon.

Two months ago I left for something I thought I would stop by at the museum, but instead found myself in a store looking for a charger for my iPhone. While standing there, I explained to my empathetic young sales assistant that I was a benched writer and that my right arm was temporarily disabled, and jokingly asked if he had a gadget that could put food in my mouth with my left hand without stabbing my eyes with a fork.

I looked ignorant when he asked if he wanted to try out the “mixed reality headset.” He explained that it is used in multimedia experiences such as watching movies and games on virtual screens. He suggested that eye tracking, coupled with voice control in the accessibility feature, could make me work.

The next moment I was sitting in the demonstration area wearing thick, heavy glass goggles. After a quick setup, a little green dot floats in the air. Tap your thumb and finger together to see a group of familiar app icons in a transparent visual overlay. Pixelization of the graphics makes the icon more clear than the chair in front of me. Eye tracking is the most surprising thing. All you need to do is look at the app you want to launch, gently tap your finger and thumb together to open the program. You can move multiple screens close or far apart, like furniture in a room.

I try other programs, open the photos and extend them to isologies. I’m watching immersive videos that look just as realistic as nightmares with dinosaurs blown away, but they’re kind of adorable and check me out the same way I keep the gaps in them. It reminds me of a parenting moment when my son was a toddler and struggled to resolve whether the stuffed animal was real or not. He was relieved to be told there was no gruffalo-like thing, despite being a replica of a stuffed animal. Once he realized it was an optical trick, he didn’t need to ask again the difference between the real thing and the pretend.

Navigating my path around various programs is a bit like learning to balance on a bike. I grow up confused. Speed ​​of movement requires constant adaptation to spatial and visual cues. I start to relax. I reach out and interact with digital objects – butterflies land on my finger. I have found myself reacting to the same wonders I experience in the real world.

And de Noument. A small dial appears on the side of the goggles, allowing you to control the reality you want to immerse yourself in. The actual room is gone and surrounded by mountain scenes. I breathe in surprise. Its spatial depth, light and shadow make the scene very clear and I feel the space around me. I know it’s not real, but the distinction is clear – I experience a mood shift as if it were. It’s similar to getting into a Piccadilly Circus tube and surface at the next stop and being on the beach in the Bahamas.

If the possibilities of these immersive spaces are slightly frightening, consider the historical adaptation of neurocognition and spatial awareness as a species, as well as the consequences of cultural and scientific advances. It takes how physics evolved because we were able to imagine visual art, the fundamental shift in spatial perspectives from two dimensions to three dimensions of painting, or the invisible behavior of the universe that is not available to the human eye.

In a few minutes, I was easily in and out of the program. Using my eyes and hands, my arms relaxed without firing nerve pain. It shows software that demonstrates breakthroughs in medical training, an immersive experience that can be used in educational environments, art, architecture and design. Seeing this, I realized I was overwhelmed by tears thinking that I might be able to work for the months leading up to my surgery and during rehabilitation.

Until my thoughts move to my next dilemma. How did you intend to break the news to your husband? 30 years of marriage and rules have always been the case. We are consulting each other about purchasing over £100. How was it when you explained it to him over the phone? What is the difference in my mood, the vision I had the following year in my life? It felt like someone had given me a smart medicine, a magical cure for brain fog. In fact, I always change goggles and painkillers.

There was only one answer. I have to bring them home so he can try it out for himself. I took a picture of the boxless purchase and texted him with the message “No heart attacks, I can return them.” He immediately texts, “I’m having a heart attack.” I leave the store with deep creative thinking and new virtual reality goggles, carrying the bag with my left arm. I take the bus that goes in the wrong direction and go without picking up a visual clue that will stop another 10.

Once I send it home, negotiations will continue all night. I’ll refrain from reviewing. He admits there is a consensus that it is relatively best on a VR headset, but that’s it. virtual reality. I think it’s like claiming that smartphones are nothing more than mobile phones. He points out that even influencers and early adopters are predicting market failures because prices are so prohibitively prohibitive (from £3,499). Why don’t you wait for prices to drop? Point out that waiting will defeat your purpose. It’s about doing my job and helping me survive mentally next year. He’s certain. He gets it and is actually at ease for me. Even it moved. The goggles stay.

A few days later During coaching on accessibility features, you can block gestures from your right arm and force a break in the part of your brain you want to steer on the right side. Accelerate your learning to become hands-free on other devices. And that’s good because I can only use my goggles for a few hours a day before I have a neck cramp with weight. But I learned to hack for that. By lying down to serve as a table of some kind.

I’m not dying with bug eyes in public, but after experiencing the panic attacks I experienced after taking them off, I am beginning to feel relieved with my new hip identity – the consequences of physical disorientation and fear towards their seductive charm.

This turned my way from friends and family despite the enormous amount of ridiculous laughter and skeptical concerns. I have not been a target of this much stack since being arrested after trying joints as a teenager. Am I at risk of letting go of my struggle to become a human in the real world? Look at this space. This article was described as hands-free.

Debora Harding’s dance with Toctopus has been published by Profile Books and Bloomsbury USA. Buy for £9.99 Guardianbookshop.com

Source: www.theguardian.com

The Unusual Mating Strategy of Monkfish May Have Contributed to Their Evolutionary Success

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A type of deep-sea angler fish called the black sea devil

Doug Perine / Alamy

The unique sexual strategy of deep-sea anglerfish may have helped their ancestors move into entirely new habitats, allowing for the incredible diversity of species that thrive today.

chase brownstein Researchers at Yale University have reconstructed the evolution of more than 160 species of deep-sea anglerfish (keratioids). Known for their large jaws and bioluminescent lures, serratioids are a subgroup of the larger order of the anglerfish family, which also includes monkfish and other bizarre benthic creatures such as monkfish, sea toads, and batfish. Using genetic sequencing, the researchers discovered that the ancestors of keratioids walked on pectoral fins at the bottom of the deep ocean. But 55 million years ago, some creatures began swimming in the ocean's vast deep-pelagic, or “midnight,” zone. There, over a period of just 5 million years, they became more genetically diverse than their ocean-floor relatives.

He said this is strange because the ocean floor and coral reefs typically have a greater variety of species. elizabeth miller At the University of California, Irvine. Environments with many topographical features lend themselves to the specialization of organisms. But with constant temperatures and vast expanses of waterless ocean, “the deep pelagic zone is truly the most homogeneous habitat on Earth,” she says.

Miller and her colleagues Monkfish species family tree Although her team and Brownstein's team used different methods, their studies are largely consistent regarding the timeline and scale of deep-sea monkfish diversification.

Brownstein's team found that this surprising diversification may be due to the serratioids' parasite-like reproductive strategy. That is, the small male uses his jaws to attach to the much larger female until he is ready to mate. In some species, the two can even permanently fuse together, such as sharing a circulatory system. This unique mating technique could theoretically benefit deep-sea monkfish, as they are very unlikely to encounter other members of their species during their lifetime.

Brownstein's analysis shows that the traits necessary for this parasitism, such as the difference in body size between males and females and the weakness of their immune systems that prevent them from attacking attached males, are the result of the evolution of monkfish diving into the deep sea. It turns out that it has existed for a long time.

“Most of this complex trait existed before the serratioids entered the deep ocean,” he says. “Basically, it's not the gas inside the engine, [of diversity]Sexual parasitism was like a preparation to press the gas pedal. ”

Miller said it's “possible” that a parasitic lifestyle helped the anglerfish invade deep-sea habitats, but it’s unclear how the fish subsequently achieved so much diversification. It remains as it is.

Answering this question will be a daunting task, especially since it is difficult to recover intact monkfish samples from the deep ocean.but cory evans Rice University in Texas says having two matching comprehensive family trees will help other researchers investigate.

“I think monkfish enthusiasts will be reading a lot of these two papers over the next six months,” he says.

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Source: www.newscientist.com