The Titanic was the first ship to use the SOS signal.
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Approximately 40% of the U.S. paper currency in circulation was counterfeit by the end of the Civil War.
47
During the Cold War, the US had planned to detonate a nuclear weapon on the moon.
25
In 1518, a "dancing plague" struck Strasbourg, Alsace, whereby hundreds of people danced fervently in the streets over the period of a month. Some suffered heart attacks or strokes, and many others died from sheer exhaustion. It remains unexplained.
19
In 1799, a boy found a 17lb. rock in a creek in North Carolina and used it as a doorstop. It was actually gold.
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