Understanding Friction: How This Essential Force Keeps Our World Moving

Men's 4x100m freestyle relay final at the Beijing 2008 Olympics

Athletes wearing friction-reducing swimsuits triumphed at the 2008 Beijing Olympics

Adam Pretty/Getty Images

Friction: Biography
Jennifer R. Vail, Harvard University Press

In 2009, the World Swimming governing body prohibited specific swimsuits from international competitions, citing unfair advantages. High-tech equipment from NASA was instrumental in designing these swimsuits, which featured ultrasonically welded seams instead of traditional stitching.

Swimmers donning these suits shattered 23 of the 25 world records during the 2008 Beijing Olympics. What made this swimwear so revolutionary? The answer lies in its remarkable ability to minimize friction between the swimmer and the water, enhancing speed and performance.

This instance illustrates the critical influence of friction in our world, a theme thoroughly investigated by Jennifer R. Vail in her book, Friction: Biography.

Bale is a tribologist, focusing on friction, wear, and lubrication as materials interact. She emphasizes, “The forces that resist movement drive us forward.” This concept forms the foundation of her work, which, while technical, delves into friction’s impact on science, technology, and civilization—a necessity as we confront future technological hurdles.

“We study friction because it is omnipresent,” Vail remarks. How did ancient Egyptians transport heavy materials for monumental projects? How do anoles and geckos scale vertical surfaces? Why was Teflon included in the Manhattan Project? What aerodynamic principles govern airplane wings? These queries all converge on friction.

From desert sands controlled by hair-like structures on animal legs to synthetic substances optimizing fluid interactions, friction plays a pivotal role, shaping everything from quantum activities to cosmic phenomena. Bale provides a detailed, passionate narrative on friction’s ubiquitous presence, showcasing its significance.


Friction has been central to civilization ever since humans began rubbing objects together to create fire.

While discussing friction, Bale emphasizes the potential risks associated with harnessing this force. Our ability to manipulate friction has been integral to civilization, from the earliest fire-starting methods to modern innovations in engines, turbines, and contact lenses.

However, it is Bale’s outlook on the future that captivates readers. Alarmingly, friction consumes approximately 40% of energy in manufacturing processes, impacting both production and friction mitigation efforts. A study highlighted that an average car’s fuel consumption was over a third burnt solely to counteract friction. In a world increasingly challenged by energy conservation, optimizing friction is vital for sustainable practices.

Vail noted that innovations in tribology could potentially save energy equivalent to 34 million barrels of gasoline annually—180 times the daily gasoline consumption in the U.S. Bale’s urgent call for more tribologists in energy certification and greater emphasis on this field in educational curriculums is vital for our energy future.

This book is essential reading. Yet, despite Bale’s engaging tone and clear enthusiasm, the complexity may overwhelm some casual readers. Nevertheless, the effort is rewarding; gaining insight into friction enriches our understanding of the world, highlighting how countless interactions shape our experiences.

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Source: www.newscientist.com

Do you prefer moving robot desserts or staying still?

Who eats who?

Will robots eat us? Or will they eat robots? Tech lovers and tech haters alike want to know which will happen first. The answer has now arrived. report The work comes from a team from the University of Electro-Communications in Tokyo and Osaka University in Japan.

Reader Bruce Gitelman alerted us to the synopsis passage: “We developed a pneumatically driven edible robot using gelatin and sugar. We investigated the robot's appearance and impressions when eating it.”

The researchers investigated the psychological reactions of the participants. “We evaluated two conditions: one in which the robot was moving and one in which it was stationary. Our results show that participants perceived a mobile robot differently from a stationary robot. We showed that the robot can be recognized in different ways and elicit different cognitions upon consumption.We also observed differences in the perceived texture when biting and biting the robot under the two conditions.”

This is yet another example of Stephen Sondheim's foresight when he wrote the musical (in previous feedback, I mentioned a case involving a duck and a monkey) Sweeney Todd: The Demon Barber of Fleet Street. Sondheim has Sweeney say this: “The history of the world is about who gets eaten and who gets eaten!”

Ketchup inside

Many types of slicable sauces are not yet popular. For now, technical hopes and resources are being poured into ketchup. Not only ketchup eaters, but also food technologists can satisfy their thirst for knowledge to some extent by reading this study. ”Texture and rheological properties of slicable ketchupPublished in the magazine gel.

“There is a lack of knowledge about sliceable ketchup,” explain the authors, who are based at three Iranian institutions: Islamic Azad University, Allameh Tabatabai University, and Institute of Food Science and Technology.

For readers who are not familiar with the field of sliced sauces, they explain: “Ketchup to be used in conjunction with sausages must be viscous as a final product, elastic in terms of textural properties, solid, and, if cool, can be cut and sliced ​​like sausages. If this research is successful, ketchup could become more than just an outer sticky coating. The interior beckons.

The research objective was to “investigate the influence of gelling hydrocolloids on the physical, textural and rheological properties of ketchup and develop new formulations of slicable ketchup and their combined use as fillers in meat products such as sausages.” “to do.”

So, I acquired a rare item called state-of-the-art ketchupree.

Ketchup on glass

The 7th European Conference on Precision Optical Component Manufacturing was held in Teisnach, Germany in 2020, according to feedback on ketchup news that broke just as the coronavirus pandemic was grabbing everyone's attention. It turns out that at the seminar, the manufacturer explained the benefits of applying ketchup to the glass. .

Max Schneckenburger and colleagues at the Center for Optical Technology in Aalen, Germany, introduced their colleagues to what was, to some, a new concept.High-precision glass polishing with ketchup”.

Their presentation explained the benefits of polishing with a “non-conventional” non-Newtonian fluid that “flows slowly under its own weight and acts like a solid under short-term stress as its viscosity increases.”

Therefore, ketchup behaves non-Newtonian in some situations. They admire the behavior. “Tomato ketchup changes its viscosity over time. The longer the ketchup is subjected to shear stress, the lower the viscosity will be. Therefore, in this article, we will discuss polishing glass surfaces with ketchup containing micro-sized Ce. We propose a new process.2O. Besides traditional ketchup, we also tested curry ketchup and organic products. ”

Schneckenburger's team used an industrial robot to guide the polishing head. To Feedback's knowledge, this was the first reported instance of a robot intentionally being placed on top of ketchup on a glass.

Financial jokes

It's fair to wonder if there's a smirk inside the financial industry, hidden deep behind the sombre and serious exterior of the buildings, business suits and hairstyles. Many top financial analysts investigate these laughs in their daily work.

What is economic laughter? The Options Industry Council, which advises investors, explains:When mapping implied volatility levels, the curve these points create typically has a “smile” or “smile” depending on the shape created by the out-of-the-money put and call levels. Identified as one of the”.

In Feedback's shaky understanding of that concept, this kind of fake smile is a raw, lopsided laugh that you see in plots when you have access to certain types of financial data.

But outside of the industry, few people see these fake smiles.

That obscurity resonates with observations made by economist John Kenneth Galbraith half a century ago about the selected attitudes of financial executives. “No one wants a funny banker,” Galbraith said.

Mark Abrahams hosted the Ig Nobel Prize ceremony and co-founded the magazine Annals of Improbable Research. Previously, he was working on unusual uses of computers.his website is impossible.com

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Moving Beyond the Authority of the Doctor: Highlighting the Importance of Patient Input in Diagnosis

A comprehensive study highlights the importance of assessing patient experience with medical diagnosis, especially in complex diseases such as neuropsychiatric lupus. This suggests a shift to a more collaborative approach between patients and clinicians to improve diagnostic accuracy and patient satisfaction.

Research highlights the need to incorporate patients’ lived experiences into medical diagnosis and advocates for a more collaborative relationship between patients and clinicians to enhance diagnosis. Accuracy and patient satisfaction.

Experts today called for more value to be given to patients’ “lived experiences” after a study of more than 1,000 patients and clinicians found multiple instances of patient underreporting. There is.

The study, led by a team from the University of Cambridge and King’s College London, found that clinicians ranked patients’ self-assessment as the least important in making diagnostic decisions, and patients were more likely to overestimate or underestimate their symptoms. It was found that patients were evaluated more frequently than patients reported doing so.

One patient shared a common sentiment that disbelief is “degrading and dehumanizing,” adding: As if I don’t have authority over it and what I’m feeling isn’t valid, in which case it’s a very dangerous environment…When I tell them the symptoms, they think the symptoms are I would say wrong, otherwise I could not feel the pain there or in that way. ”

Diagnostic issues of neuropsychiatric lupus

In a study published today (December 18th), RheumatologyUsing the example of lupus neuropsychiatric, an incurable autoimmune disease that is particularly difficult to diagnose, researchers examined the different values ​​clinicians place on 13 different types of evidence used in diagnosis. . This includes evidence such as brain scans, patient views, and observations of family and friends.

Less than 4% of clinicians ranked patient self-assessment among the top three types of evidence. Clinicians ranked themselves among the highest despite admitting that they often lack confidence in diagnoses that involve less visible symptoms such as headaches, hallucinations, and depression. It has been reported that such “neuropsychiatric” symptoms can lead to poor quality of life and early death, and are more often misdiagnosed and therefore not treated correctly than more visible symptoms such as rashes. It has been.

Aiming for a collaborative relationship between patients and clinicians

Sue Farrington, co-chair of the Rare Autoimmune Rheumatic Diseases Alliance, said: “We are moving away from the paternalistic and often dangerous ‘doctor knows best’ mentality and towards patients with lived experience. “The time has come for experienced physicians to move towards a more equal relationship.” The learned experience works more collaboratively. ”

Almost half (46%) of the 676 patients reported never or rarely being asked about their self-assessment of their illness, while others were very positive. I talked about my experiences. Some clinicians, particularly psychiatrists and nurses, value patient views, with a Welsh psychiatrist explaining: “Patients often arrive at the clinic having undergone multiple evaluations, researched their condition to a very high level, and worked hard to understand what’s going on with their body. …They are often expert diagnosticians in their own right.”

Lead author Dr Melanie Sloan, from the University of Cambridge’s School of Public Health and Primary Care, said: After all, these are people who know what it’s like to live with their condition. However, we also need to ensure that clinicians have time to fully investigate each patient’s symptoms, which is difficult within the constraints of our current healthcare system. ”

Gender and ethnicity in diagnosis

It was felt that the personal characteristics of patients and clinicians, such as ethnicity and gender, could influence the diagnosis, and there was a recognition that women in particular were more likely to be told that their symptoms were psychosomatic. The data showed that male clinicians were statistically more likely to state that patients were exaggerating their symptoms. Patients were more likely than clinicians to say that their symptoms were directly caused by the disease.

Conclusion: Emphasize patient contribution in diagnosis

While the study authors acknowledge that patients’ reasoning is sometimes inaccurate, there are many potential benefits to incorporating patients’ “attributional insights” and experiences into decision-making (diagnostic accuracy, They concluded that there is a high likelihood that this will result in a reduction in misdiagnosis, an increase in patient satisfaction, etc. diagnosis. This comes at a time when it is widely known that diagnostic tests for neuropsychiatric lupus erythematosus, like many other autoimmune diseases and long-term COVID-19 infections, are “not enlightening,” according to one neurologist. Especially important.

Lead study author Dr Tom Pollack, from the Institute of Psychiatry, Psychology and Neuroscience at King’s College London, said: mistaken. However, especially when diagnostic tests are not advanced enough to consistently detect these diseases, evaluating both perspectives in combination can reduce misdiagnosis, improve clinician-patient relationships, and improve symptom reporting. There could be more trust and openness. ”

Reference: “Attribution of neuropsychiatric symptoms and prioritization of evidence in the diagnosis of neuropsychiatric lupus: A mixed methods analysis of patient and clinician perspectives from the international INSPIRE study” Melanie Sloan, Laura Andreoli, Michael S. Zandi, Rupert Harwood, Melvi Pitkanen, Sloan by Sam, Colette Barea, Eftalia Massu, Chris Whincup, Michael Bosley, Felix Norton, Mandeep Ubi, David Jayne, Guy Leszziner, James Brimicombe, Wendy Dement, Kate Middleton, Caroline Gordon, David D’Cruz, Thomas A. Pollack, December 18, 2023, Rheumatology.
DOI: 10.1093/Rheumatology/kead685

This research was funded by The Lupus Trust and LUPUS UK.

Source: scitechdaily.com

Deep Tech: Moving Beyond Science Fiction

These industries lead the way

After reaching the height, hit an all-time high in 2021, but startup exits hit an all-time low over the past 12 months as interest rates soared, access to cheap capital decreased, and cash opportunities dried up. . Total exits for U.S. companies and venture capital investors in the first half of 2023 were the lowest in nearly 15 years. According to PitchBook data.

However, in Q3 we saw some light at the end of the tunnel with PE/VC reaching the exit in August. Highest price in the last 22 months. Perhaps surprisingly, deep tech companies, which I define as companies leveraging new technologies, or engineering-driven innovation, contributed to the initial slow recovery of companies new to the field. are doing.See Crunch Base Billion dollar startup exits By 2023, a quarter of the 16 exiting unicorns will be deep tech companies. This comes as no surprise to our team, given the huge number of deep tech unicorns that have been born over the past few years. In 2021, we compiled a list A study of deep tech companies valued at over $1 billion found that 120 deep tech unicorns have already generated nearly $5 trillion in value.

Many earth-changing deep technology solutions are being commercialized, and the number and scale of successful exits continues to increase.

However, for those who do not closely follow the deep tech space on a daily basis, it is likely that they still believe that it is impossible to build a deep tech unicorn and that there are only a handful of opportunities to exit deep tech each year. there is. But the truth is, deep technology innovation is no longer science fiction or research experiment. Many earth-changing deep technology solutions are being commercialized, and the number and scale of successful exits continues to increase. In that sense, the exit of deep tech is no longer science fiction. To understand this better, our team recently analyzed the world’s deep technology withdrawals over the past decade (2013-2022) in what we believe is an industry first. As a result, the following was revealed.

Deep tech unicorn exits increase by 550% from 2018 to 2022

Source: techcrunch.com