A mother polar bear stunned scientists by swimming 427 miles across open Arctic water in just nine days. Her near nonstop journey highlights the extreme physical demands polar bears now face as sea ...

I’m from the heat of South Texas, where warmth is constant and familiar. The idea of plunging into cold water doesn’t come naturally to me — every instinct says resist. I hesitate at the edge, toes ...

For nine days, a polar bear mother, formally known as Bear #20741, did not stop swimming. In the vast, open water of the Arctic, where solid ice once stretched for miles, the female polar bear pushed ...