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Biological aging may not be caused by what we thought

What causes aging? A new study that links two known aspects of aging — genetic mutations and epigenetic changes — may help find the answer. (Image credit: hh5800 via Getty Images) Scientists often use an “epigenetic clock” to estimate biological…

270-million-year-old fossil named after Kermit the Frog

This is the fossilized skull of an ancient amphibian named after Kermit the Frog. (Photo credit: Brittany M. Hance, Smithsonian/University of California) A newly described species of protoamphibian that lived 270 million years ago has been named after Kermit the…