On this day in 1949, 12 nations signed the North Atlantic Treaty creating the North Atlantic Treaty Organization (NATO).
On this day in 1958, the CND peace symbol was displayed in public for the first time in London.
On this day in 1964, The Beatles occupied the top five positions on the Billboard Hot 100 pop chart.
On this day in 1968, Martin Luther King Jr. was assassinated by James Earl Ray at a motel in Memphis, Tennessee.
And on this day in 1983, Space Shuttle Challenger made its maiden voyage into space.