Science

Science

What can killer whales teach us about menopause?

Menopause is a puzzle for biologists. Why would the female of a species cease to reproduce half way through her life, when natural selection favors characteristics that help an individual's genes survive? A study of killer whales — one of only two mammals apart from humans to undergo menopause — is providing clues.

Science

A high-powered telescope peers into the dark heart of a black hole

Black holes may be exotic, but they are hardly rare. Every galaxy has one, including ours. But it's tough to look at and study black holes since their gravitational pull is so powerful light can't escape from them. But thanks to a new telescope that captures high-energy x-rays, NASA scientists are peering at their edges, confirming Einstein's theories, and may have gotten the first glimpse of a new kind of black hole.