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 - Sony Walkman
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Rockheim/Wikimedia Commons

1979: Sony introduces the Walkman portable audio cassette player in Japan. The Walkman would go on sale in the United States in June 1980. The device revolutionized music listening habits by allowing people to easily carry music with them and listen to music through lightweight headphones.

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