“Mad as a hatter” In 18th and 19th century England, mercury was used in the production of felt, which was used in the manufacturing of hats common of the time. People who worked in these hat factories were exposed daily to trace amounts of the metal, which accumulated within their bodies over time, causing some workers to develop dementia caused by mercury poisoning. Thus the phrase “Mad as a Hatter” became popular as a way to refer to someone who was perceived as insane.
Hatshepsut is one of the most powerful women in the ancient world and one of the best monks in ancient Egypt. She was the fifth pharaoh of the eighteenth dynasty of Egypt and ruled longer than any ruler in Egyptian history.