Add Yahoo as a preferred source to see more of our stories on Google. Guest Opinion. Altruism is helping without a benefit and sometimes at a risk to one’s self. Animals helping others of their own ...

SALT LAKE CITY — Each spring, a grizzly bear emerges from its den after months of deep hibernation — having eaten nothing, barely moved and slowed its heart and metabolism to a crawl. Yet it wakes up ...

New fossil research shows how human impacts, particularly through the rise of agriculture and livestock, have disrupted natural mammal communities as profoundly as the Ice Age extinctions. Fossil ...