ATMORE, Ala. (AP) — Alabama carries out the nation's 4th execution with nitrogen gas on a man convicted of a 1991 murder.

Scientists are not sure how much metallic dust remained in the atmosphere after the most recent SpaceX rocket 'disassembly.' ...

A 17.75 mg sample was processed and analyzed for N-heterocycles—organic molecules with a ring structure containing carbon and ...

Scientists detected all five nucleobases -- building blocks of DNA and RNA -- in samples returned from asteroid Bennu by NASA's OSIRIS-REx mission.