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A new Stanford-led study finds that switching permanently to standard time could prevent 300,000 strokes and reduce obesity in 2.6 million Americans by better aligning circadian rhythms with natural light. Researchers argue that the twice-yearly clock changes are the worst option for public health, while permanent daylight saving time would offer two-thirds of the benefits. From a report: "We found that staying in standard time or staying in daylight saving time is definitely better than switching twice a year," senior researcher Jamie Zeitzer said in a news release. He's a professor of psychiatry and behavioral sciences at Stanford University in California. For the study, researchers estimated how different national time policies might affect American's circadian rhythms -- the body's innate clock that regulates many physiological processes. The human circadian cycle isn't exactly 24 hours, researchers noted. It's about 12 minutes longer for most people, and it can be changed based on a person's exposure to light. "When you get light in the morning, it speeds up the circadian cycle. When you get light in the evening, it slows things down," Zeitzer said. "You generally need more morning light and less evening light to keep well synchronized to a 24-hour day." An out-of-sync circadian cycle has been linked with many different poor health outcomes, researchers said. "The more light exposure you get at the wrong times, the weaker the circadian clock," Zeitzer said. "All of these things that are downstream -- for example, your immune system, your energy -- don't match up quite as well." Most people would experience the least circadian burden under permanent standard time, which prioritizes morning light, researchers found. The research team then linked its analysis of circadian rhythms to county-level data from the U.S. Centers for Disease Control and Prevention (CDC) to see how each time policy might affect people's health. Their models showed that permanent standard time would reduce obesity nationwide by 0.78% and stroke by 0.09%. Those seemingly small percentage changes, when played out across the national population, would mean 2.6 million fewer people with obesity and 300,000 fewer cases of stroke. Permanent daylight savings time would result in a 0.51% drop in obesity -- around 1.7 million people -- and a 0.04% reduction in strokes, or 220,000 cases. Either move would help American health. "You have people who are passionate on both sides of this, and they have very different arguments," Zeitzer said. The findings have been published in the Proceedings of the National Academy of Sciences.

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China's internet regulator has told the country's biggest technology companies to stop buying all of Nvidia's artificial intelligence chips and terminate their existing orders, as Beijing steps up efforts to boost its homegrown semiconductor industry and compete with the US. From a report: The Cyberspace Administration of China (CAC) informed companies including ByteDance and Alibaba this week to terminate their testing and orders of the RTX Pro 6000D, Nvidia's tailor-made product for the country introduced two months ago, according to three people with knowledge of the matter. Several companies had indicated they would order tens of thousands of the RTX Pro 6000D, and had started testing and verification work with Nvidia's server suppliers before telling them to stop the work after receiving the CAC order, said the people.

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"Phys.org is reporting on a study published in Nature Physics involving ICN2 at the UAB campus, Xi'an Jiaotong University (Xi'an) and Stony Brook University (New York), showing for the first time that ordinary ice is a flexoelectric material -- meaning it can generate electricity when subjected to mechanical deformation," writes longtime Slashdot reader fahrbot-bot. From the report: "We discovered that ice generates electric charge in response to mechanical stress at all temperatures. In addition, we identified a thin 'ferroelectric' layer at the surface at temperatures below -113C (160K)," explains Dr. Xin Wen, a member of the ICN2 Oxide Nanophysics Group and one of the study's lead researchers. "This means that the ice surface can develop a natural electric polarization, which can be reversed when an external electric field is applied -- similar to how the poles of a magnet can be flipped. The surface ferroelectricity is a cool discovery in its own right, as it means that ice may have not just one way to generate electricity, but two: ferroelectricity at very low temperatures, and flexoelectricity at higher temperatures all the way to 0 C." This property places ice on a par with electroceramic materials such as titanium dioxide, which are currently used in advanced technologies like sensors and capacitors.

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