Extras
Crows remembered the face of a person they considered a threat—even across generations.
Otzi, a 5,000-year-old mummy, has 61 tattoos arranged in 19 groups across his body.
The faster you move, the stranger time becomes.
In 1912, Albert Einstein had a revolutionary idea.
Could these bones be the last remains of a legendary Viking army?
Go behind the scenes as NOVA visits the Vera Rubin Observatory in Chile.
Fifty-million years ago these rocks were trees and this Arctic tundra was a steamy swap.
At first, scientists thought it was a gigantic marine reptile.
