It doesn't seem like a big deal today, but 1930s America lived in fear of the male nipple.

On March 25, 1969, John Lennon and Yoko Ono were a few days into their marriage when they invited the press to join them at their honeymoon suite at the Amsterdam Hilton Hotel.

In the 1950s, a child trying to call Santa Claus accidentally called NORAD and changed Christmas Eve forever.

Toys R Us founder Charles Lazarus had no idea how big the toy industry would become.

The nurse who founded the American Red Cross had no formal training in medicine. She tended to countless wounded soldiers.

Jazz singer Ethel Ennis’s voice wowed audiences and won praise from critics. But when she was faced with the opportunity to become a superstar, Ennis chose a different path.

Elaine Brown's takeover in 1974 was a pivotal moment for a woman in the black power movement. Although women had been a dynamic force for social and racial justice, they had often been overshadowed by men.

For many, memories of that devastating day quickly revert to that silent, flickering sequence captured by Abraham Zapruder. It is as chilling as it is familiar: the approaching convertible, the waves of a crowd about to lose its innocence.

When Prince Harry and his fiancee Meghan Markle are married this weekend, there will be one other royal on the world’s minds - Harry’s mother, the beloved Princess Diana.

The British royal wedding puts all eyes on the Windsor family - this time, Prince Harry and Meghan Markle. But perhaps no royal is as controversial as Harry's grandfather, Prince Philip.