Tunguska-Sized Impact Destroyed Jordan Valley City 3,670 Years Ago

Fossil Footprints Reveal Humans Inhabited North America Over 21,000 Years Ago

Life expectancy gap between black and white Americans closes nearly 50 percent in 30 years

Zeroing in on the origins of Earth’s “single most important evolutionary innovation." A new study shows oxygenic photosynthesis likely evolved between 3.4 and 2.9 billion years ago.