On this day: July 1

Posted: 4:06 PM EDT Jun 28, 2013   Updated: 2:00 AM EDT Jul 01, 2015
Sony Walkman cassette player

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.