A UN report warns that nearly half of the world’s migratory species are declining, and about one in four face the risk of extinction.

Newly released Mars images offer a detailed look at one of the Red Planet's oldest, most heavily cratered regions, a landscape shaped by billions of years of impacts, volcanism and erosion.

An alleged screenshot of a 2006 4chan post displayed a user's warning about a dark future, predicting pandemics and World War ...