Her resume continued to grow. Breed set a world record as the fastest woman to swim the length of Lake Tahoe, finishing the nearly nine-hour crossing in frigid water. She also became the first person ...

For instance, it has been argued that as the modern human Y chromosome replaced the Neanderthal equivalent, Neanderthal males became sterile. Other research suggests that human genes might have messed ...

A new study shows penguins are breeding earlier than ever in the Antarctic Peninsula. This region is one of the fastest-warming areas of the world due to climate change, and penguins time their ...