Moonlight, moon bright, how bright is the moon you see tonight? Science doesn’t know for sure.

A new book surveys penguin biology and Antarctic exploration history.

The key to managing stable ischemic heart disease “really is medicines, medicines, medicines. That’s what’s going to stop you from having a heart attack.”

Devil worms are among the deepest-living land animals found to date.

Parker is on a nearly seven-year mission to repeatedly soar close to the sun and gather intel on mysteries that have plagued solar physicists for decades.

Some scientists are touting the finding as the first real genetic evidence for two theories about domestication.

The crew endured the long darkness of the polar winter, when temperatures can plummet as low as –50° Celsius and evacuation is impossible.

Origolestes lii was a shrew-sized mammal that lived about 123 million years ago in an ecosystem known as the Jehol Biota in what’s now China.

In the U.S., the wealth gap between the haves and the have-nots is still wide.

Blast this single-celled organism with a stream of plastic beads and it does more than creep away. It can swerve, spit, duck and flee to evade the irritant.