On this day in 1880, Thomas Edison received the patent on the incandescent lamp.
On this day in 1967, the United States, United Kingdom, and Soviet Union signed the Outer Space Treaty in Washington, D.C., banning deployment of nuclear weapons in space, and limiting use of the Moon and other celestial bodies to peaceful purposes.
On this day in 1996, Germany first observed International Holocaust Remembrance Day.
On this day in 2006, Western Union discontinued its Telegram and Commercial Messaging services.