Approximately 40% of the U.S. paper currency in circulation was counterfeit by the end of the Civil War.
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The Taj Mahal took 20 years and 20 thousand men to finish!
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Leonardo Da Vinci predicted the mass use of solar energy as long ago as 1447.
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In Ancient Greece, if a woman watched even one Olympic event, she was executed.
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In 2011, a couple bought a box of textbooks for $10. Inside, they found a 25-cent bill signed by the president of the Republic of Texas, Sam Houston, and subsequently sold it for $63,250.
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Leonardo Da Vinci made a robotic lion in 1515 that would walk, sway, open its mouth and move its tail - it even had a compartment that opened to present flowers.
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