On this day: July 15

Published On: Jul 10 2013 03:20:40 PM CDT   Updated On: Jul 15 2016 01:00:00 AM CDT

Jerusalem falls to the Crusaders, the Rosetta Stone is uncovered, Napoleon surrenders, the Nintendo Entertainment System debuts in Japan, and Psy unleashes "Gangnam Style" on the Internet, all on this day.

OTD July 15 - Hippolyte Mège-Mouriés
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Public domain

1869: Margarine is patented by Hippolyte Mège-Mouriés in France. He had won a contest held by Emperor Napoleon III to find a substitute for butter used by the French Navy. His formula included a fatty component that mixed to a pearly luster, so he named his product after the Greek word for pearl: margaritari.

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