Four owlets watch a butterfly in near-perfect synchronization

21-years old Yves Saint Laurent at Christian Dior's funeral (1957)

Benjamin Franklin left $2,000 to Boston and Philadelphia to help young people in those cities. He stipulated in his will that cities could not draw the balance for 200 years. In 1990, it was worth $6.

Scientists launched rockets into the Arctic sky and released glowing clouds to map invisible winds in the aurora