On this day in 1983, Space Shuttle Challenger made its maiden voyage into space.
On this day in 1991, the current flag of Hong Kong was adopted for post-colonial Hong Kong during the Third Session of the Seventh National People's Congress.
On this day in 2002, the Angolan government and UNITA rebels signed a peace treaty ending the Angolan Civil War.
On this day in 2009, three police officers were shot and killed during a shootout in Pittsburgh, Pennsylvania.