Skip the roses this Valentine’s Day, and grab your binoculars and a field guide for science, with this weekend's Great Backyard Bird Count.

Ancient footprints challenge the timeline of human arrival in North America, suggesting people were here much earlier than once believed.

The four Crew-12 astronauts brought the International Space Station’s staff back to seven after a month of operating with three people on board.

Five European countries, including Britain, France and Germany, said Saturday that Russian opposition leader Alexei Navalny was killed by a "rare toxin" from a dart frog and that the Russian state was ...

Listeria, a bacterium that is often cited in food recalls, is one of the leading causes of death from foodborne illness in ...

LONDON (AP) — Russian opposition leader Alexei Navalny was poisoned by the Kremlin with a rare and lethal toxin found in the skin of poison dart frogs, five European countries said Saturday.