On this day: July 1

Published On: Jun 28 2013 03:06:05 PM CDT   Updated On: Jul 01 2016 01:00:00 AM CDT

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 - PG-13
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1984: The PG-13 rating is introduced by the MPAA. The rating, which indicates that some material may be inappropriate for children under 13, was first given to the movie "Red Dawn," released in August 1984.

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