Millions of years ago, something remarkable happened in Earth’s oceans. Marine animals began to live in deeper parts of the sea, where life had not been possible before. New research shows that this ...

Scientists rethink why giant insects once ruled the skies, finding oxygen may not explain their size or disappearance.

Nearly 4,000 m beneath the Pacific, in water so dark that sunlight has never penetrated, scientists have stumbled on a new way that oxygen can appear where it should not exist. The finding, quickly ...