On this day: July 1

Published: Jun 28 2013 04:06:05 PM EDT   Updated On: Jul 01 2014 02:00:00 AM EDT

The Battle of Gettysburg begins, America's first zoo opens, the first Tour de France starts, the Sony Walkman hits the market, the PG-13 movie rating is introduced, and the Deepwater Horizon oil spill breaks an unfortunate record, all on this day.

OTD July 1 - Deepwater Horizon
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Reuters

2010: In volume, BP's Deepwater Horizon oil spill overtakes Ixtoc I, which leaked 130 million gallons off Mexico's coast from 1979 to 1980, to become the worst oceanic oil spill in U.S. recorded history. Before it was capped on July 15, 2010, the Deepwater Horizon oil spill discharged 210 million gallons of oil, making it the largest accidental marine oil spill in the history of the petroleum industry.

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  • Soviet cosmonaut dogs Dezik and Tsygan

    Russian Federal Space Agency

    On this day: July 22

    Wiley Post completes the first solo flight around the world, John Dillinger is gunned down behind a Chicago theater, two Soviet dogs become cosmonauts, and Prince George arrives to great fanfare, all on this day.