Here's How Many Years in Advance We'd Need to Stop a Killer Asteroid Coming For Earth

Historians Find Genius System That Kept Ancient World's Longest Water Channels Clean

Tens of Millions of Western Birds Depend on These Two Regions During Migration — California’s Central Valley and the Colorado River Delta are critical stopover sites for dozens of migrant species, according to new research.

Hear the Eerie Sounds of Interstellar Space Captured by NASA’s Voyager