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On this day: July 1

Published On: Jun 28 2013 03:06:05 PM CDT   Updated On: Jul 01 2013 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 - natural selection
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Public domain

1858: Charles Darwin's (pictured) and Alfred Russel Wallace's papers on evolution are read in a joint presentation to the Linnean Society. This was the first announcement of the Darwin-Wallace theory of evolution by natural selection, which would appear in print for the first time the following month.

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