Cannibalism Is More Ancient Than Once Thought, Trilobite Fossils Suggest

Cleopatra: Biography of the last pharaoh of ancient Egypt

New genetic tricks for boosting crop yield take clues from ancient farmers

NASA's Perseverance rover begins 3-mile dash to the martian delta that scientists hope holds signs of ancient microbial life. Ingenuity helicopter will scout ahead after mission extended until at least September.