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This Day in History, September 16
On September 16th, 1956, Play-Doh was introduced to the world.

This Day in History, September 15
On September 15th, 1835, Charles Darwin, aboard the HMS Beagle, reached the Galapagos Islands.

This Day in History, September 14
On September 14th, 1959, the Soviet probe Luna 2 crashed on the Moon, becoming the first man-made craft to land on it.

This Day in History, September 13
On September 13th, 122, the building of Hadrian's Wall began.

This Day in History, September 12
On September 12th, 1992, NASA launched the Space Shuttle Endeavour, marking the 50th space shuttle mission.

This Day in History, September 11
On September 11th, 1683, the Battle of Vienna took place.

This Day in History, September 10
On September 10th, 1913, the first paved coast-to-coast U.S. highway opened.

This Day in History, September 9
On September 9th, 1739, 1542, Mary Stuart was crowned "Queen of Scots" at the age of nine months.

This Day in History, September 8
On September 8th, 1971, the John F. Kennedy Center for the Performing Arts was inaugurated.

This Day in History, September 7
On September 7th, 1251 BC, the mythical hero Heracles is believe to have been born.

This Day in History, September 6
On September 6th, 1628, the Puritans settled Salem, Massachusetts.

This Day in History, September 5
On September 5th, 1793, the Reign of Terror was initiated to strike back against the French Revolution.

This Day in History, September 4
On September 4th, 1964, Scotland's Forth Road Bridge officially opened.

This Day in History, September 3
On September 3rd, 1976, the Viking 2 took the first close-up, color photographs of Mars.

This Day in History, September 2
On September 2nd, 1666, the Great Fire of London broke out and burned for three days.

This Day in History, September 1
On September 1st, 1974, the SR-71 Blackbird set the record for shortest flight from New York to London.

This Day in History, August 31
On August 31st, 1997, Diana, Princess of Wales, died in a car crash.

This Day in History, August 30
On August 30th, 1850, Honolulu, Hawai'i became an official city.

This Day in History, August 29
On August 29th, 1756, the Seven Years' War began.

This Day in History, August 28
On August 28th, 1884, the first known photograph of a tornado was made.