
| Marcus Aurelius, Roman emperor, philosopher | |
| Louis-Napoleon (Napoleon III), emperor of France (1852-71) | |
| Adolf Hitler, Braunau Austria, dictator of Nazi Germany | |
| Harold Lloyd, silent comic (Why Worry, Safety Last), Burchard Neb | |
| Lyrid meteor shower, radiant in Hercules | |
| British begin siege of Boston | |
| Marie and Pierre Curie isolated radioactive element radium | |
| First electron microscope demonstrated, Philadelphia, Pa | |
| Canadian ANIK A2 became first commercial satellite in orbit | |
| Korean Air Lines 707 forced to land; violated Soviet airspace | |
By Scott Labrecque version 9.4.0.0