Cleopatra married two of her brothers.
47
Contrary to popular belief, the first ironclad warships were built by Korea in the 16th century.
14
The flushing toilet was invented in 1596, not by Thomas Crapper as most people think, but by Sir John Harington.
98
Ancient Romans at one time used human urine as an ingredient in their toothpaste.
37
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