Where did the term "mad hatter" come from? Can trees or monkey guts clean mercury? Who killed the guy that killed Lincoln, and why? Spoiler - The answers are related!

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Sources:

History Channel site article, updated 2018

• https://www.history.com/news/where-did-the-phrase-mad-as-a-hatter-come-from

New England Historical Society site article, updated 2021

• https://www.newenglandhistoricalsociety.com/mad-hatters-danbury-conn/

NYTimes 2004 site article; Super Trees

• https://www.nytimes.com/2004/11/21/nyregion/super-trees.html#:~:text=These%20are%20no%20ordinary%20trees,to%20absorb%20mercury%20from%20soil.

Oxford Academic Journal site

• https://academic.oup.com/femsec/article/87/1/52/508980