On this day: October 31

Published On: Oct 31 2012 12:59:09 AM EDT   Updated On: Oct 31 2013 02:00:00 AM EDT

The first All Hallows' Evening is celebrated, Nevada becomes a state, Harry Houdini dies, Mount Rushmore is completed, and the Vatican apologizes to Galileo, all on this day.

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2011: According to the United Nations Department of Economic and Social Affairs' Population Division, the world population reaches seven billion people.