TIL that the Mad Hatter from Alice in Wonderland is “mad” because of mercury poisoning, in which hats are made from animal skins treated with mercury. : r/TIL_Uncensored
Erethism - Wikipedia
How Poisonous Chemicals Created The Phrase 'Mad Hatter' | Discover Magazine
Did the Mad Hatter have mercury poisoning?
Horrible Health and Safety Histories: Erethism or Mad Hatter Syndrome | Amalgamate Safety Risk Management