Extras
Crows remembered the face of a person they considered a threat鈥攅ven 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.
They paid only $27.50 for it from a London bookseller in 1946.
Could these bones be the last remains of a legendary Viking army?
You probably won鈥檛 win big playing the Lottery but your brain may want to keep trying.
Go behind the scenes as NOVA visits the Vera Rubin Observatory in Chile.
At first, scientists thought it was a gigantic marine reptile.
