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A sweeping analysis of thousands of animal genomes suggests that chromosomes do not evolve randomly but instead follow a limited number of irreversible "evolutionary highways." These one-way genetic changes preserve clues to more than 600 million ...

NASA scientists found that microbes brought by astronauts could survive in cold, shadowed niches around the Moon's South Pole, potentially complicating future searches for pristine lunar chemistry. Some refuges may be no larger than a footprint, ...

A major study found that adults with depression show disrupted production of new neurons in the hippocampus, potentially weakening the brain's ability to separate new experiences from painful memories. The researchers also identified broad molecular ...

People who reach 110 and beyond appear to have unusually large numbers of rare immune cells capable of killing abnormal cells. These CD4 cytotoxic T cells became more common with age and often expanded into large groups of nearly identical cells, ...

A massive test of gravity across the cosmos found that it behaves almost exactly as Newton and Einstein predicted, even across galaxy clusters hundreds of millions of light-years apart. The result weakens some modified-gravity explanations and ...

Common medications may reshape the gut microbiome long after the last dose is taken. In a study of more than 2,500 people, researchers found lasting microbial changes linked not only to antibiotics, but also to antidepressants, beta-blockers, acid .. ...

Backyard bird feeders could become unexpected hotspots for H5N1 as Australia's bird flu outbreak spreads, bringing species together in ways that rarely occur naturally. Experts say stopping feeding is safest, while smaller amounts of food, no hand .. ...

A faint ribbon of stars around a distant galaxy has become the first globular cluster stellar stream ever identified beyond the Milky Way. Because the stars trace the galaxy's gravity, researchers used the stream to estimate how much invisible dark . ...

Researchers have created a tiny chip that produces a stable "rainbow" of light capable of generating multiple high-frequency signals at once, potentially boosting the speed and capacity of future 6G networks. Its extreme precision could also make it ...

Both too little and too much sleep may be linked to faster aging throughout the body. Researchers analyzing 23 biological aging clocks found the lowest aging levels among people sleeping about 6.4 to 7.8 hours per day. Short or long sleep was also .. ...