Approximately 40% of the U.S. paper currency in circulation was counterfeit by the end of the Civil War.
47
The Taj Mahal took 20 years and 20 thousand men to finish!
83
Leonardo Da Vinci predicted the mass use of solar energy as long ago as 1447.
153
In Ancient Greece, if a woman watched even one Olympic event, she was executed.
40
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.
13
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.
22


