Manatees are dying in droves this year. The die-offs could spell trouble for Florida

4.5 billion-year-old particles from the sun lurk in Earth's core and mantle

Astronauts on Set: Space Station May Host Wave of TV Shows and Films. A Discovery reality TV competition, a Russian medical thriller, and more productions could be heading to the orbital outpost in the next year.

Assessment of SARS-CoV-2 reinfection 1 year after primary infection in Lombardy, Italy