Leonardo Da Vinci predicted the mass use of solar energy as long ago as 1447.
153
During the Cold War, the US had planned to detonate a nuclear weapon on the moon.
25
During the Black Plague, it was thought that bad smells were the cause of the plague. "Plague Doctors" therefore wore masks with long beak-like noses stuffed with flowers or smoke to hide the smells.
19
Cleopatra married two of her brothers.
47
France’s King Louis XIV was offered biological weapons by an Italian chemist. He not only refused, but also paid the chemist an annual salary to never reveal the technology to anyone else.
21
Tablecloths were originally meant to serve as towels with which guests could wipe their hands and faces after dinner.
78
London's Pall Mall became the first street lit by gaslight in 1807!
39