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The stereotype of the old forgetful person whose memory often fails him is widely held, but the reason for its appearance was never really pinpointed. Much like gray hair and wrinkles, it was just thought to be part of growing old. Now new research from Adam M. Brickman, PhD, of the Taub Institute for Research on Alzheimer’s Disease and the Aging Brain at Columbia University Medical Center in New York, shows that silent strokes may be the cause. Essentially small dead spots in the brain are found in one out of four elderly people…

Many of the particles in the atmosphere are produced by the natural world, and it is possible that plants have in recent decades reduced the effects of the greenhouse gases to which human activity has given rise. One consequence of this is that the climate may be more sensitive to emissions caused by human activity than we have previously believed. Scientists at the University of Gothenburg (Sweden) have collected new data that may lead to better climate models…

Scientists studying a unique collection of human skulls have shown that changes to the skull shape thought to have occurred independently through separate evolutionary events may have actually precipitated each other. Researchers at the Universities of Manchester and Barcelona examined 390 skulls from the Austrian town of Hallstatt and found evidence that the human skull is highly integrated, meaning variation in one part of the skull is linked to changes throughout the skull…