1889: Birth of German dictator Adolf Hitler.
1972: The Apollo 16 mission lands on the Moon after battling for six hours, with the crew of John Young and Charles Duke becoming the fifth team in history to land on the Moon.
2008: The first South Korean astronaut Yeosyeon returns safely to Earth after spending nine days aboard the International Space Station.
2011: Indian Space Research Organization's (ISRO) satellite launch vehicle 'PSLV' successfully installed three satellites in space on Wednesday, April 20, 2011.
1972: Mamta Kulkarni, Indian actress was born.
1912: Irish novelist Bram Stoker, who created the character Count Dracula, passed away.
1946: The League of Nations, the predecessor of the United Nations, was dissolved.
1878: The Stawell Gift was introduced for the first time in Australia.