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On this day: August 21

Published On: Aug 20 2012 02:02:16 PM CDT   Updated On: Aug 21 2013 01:00:00 AM CDT

Lincoln and Douglas square off for the first time, Oldsmobile begins production, Hawaii becomes a state, and The Mona Lisa and the Mars Observer go missing, all on this day.

OTD August 21 - Winklevoss twins
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Stephen Lam/Reuters

1981: Twins Cameron and Tyler Winklevoss, best known for suing fellow Harvard alum Mark Zuckerberg, claiming he stole their idea for Facebook, are born in Southampton, N.Y. They are also venture capitalists, having led a seed funding round for Bitcoin payment processor BitInstant.

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