LOS ANGELES (Reuters) - The nearly complete skeleton of a massive Columbian mammoth who died during the last ice age has been dug out of a construction site near the La Brea Tar Pits in downtown Los Angeles, a remarkable find even in the fossil-rich area, scientists said Wednesday.
CHICAGO (Reuters) - U.S. scientists proposed a new theory on Wednesday of how Alzheimer's disease kills brain cells they said opens new avenues of research into treatments for the fatal, brain-wasting disease.
LONDON (Reuters) - Tropical trees have grown bigger over the past 40 years and now absorb 20 percent of fossil fuel emissions from the atmosphere, highlighting the need to preserve threatened forests, British researchers said Wednesday.
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