On this day: September 17

Published: Sep 14 2012 02:49:58 PM EDT   Updated On: Sep 17 2012 02:00:00 AM EDT

The U.S. Constitution is signed, the Civil War sees the bloodiest battle in American history, the prototype space shuttle Enterprise is unveiled, and the Camp David Accords bring peace between Egypt and Israel, all on this day.

OTD September 17 - Antonie van Leeuwenhoek
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1683: Antonie van Leeuwenhoek writes a letter to the Royal Society describing "animalcules," the first known description of protozoa.

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