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On this day: February 4

POSTED: 01:03 AM PST Feb 03, 2013    UPDATED: 11:00 PM PST Feb 03, 2014 

George Washington is elected America's first president, the Symbionese Liberation Army kidnaps Patty Hearst, Fleetwood Mac releases "Rumours," and Facebook is launched, all on this day.

OTD February 4 - teflon
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iStock/Lusoimages

1941: Roy Plunkett receives a U.S. patent for "Tetrafluoroethylene Polymers," now known under the trade name Teflon, which he assigned to his employer, Kinetic Chemicals Inc. of Wilmington, Del. The material is used as a non-stick coating for pans and other cookware. Teflon was discovered by accident on June 6, 1938, when Plunkett noticed a lining of the solid polymer had formed inside containers that had stored tetrafluoroethylene gas under pressure.

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