If you prefer to watch your history, PBS’ American Experience documentary series did an episode based on Blum’s book (see http://www.pbs.org/wgbh/americanexperience/films/poisoners ); it can be streamed via a bunch of different video services.
Worse still, Midgely worked actively to cover the risks of lead up. He even held a press conference in 1924 where, to assure reporters that TEL was safe, he washed his hands in a bowl of the stuff (https://www.bbc.com/news/business-40593353)!
Deborah Blum covered the whole story in her excellent 2011 book, The Poisoner's Handbook (https://www.amazon.com/Poisoners-Handbook-Murder-Forensic-Me...). Blum excerpted the story of TEL for a piece in Wired, which can be read here: https://www.wired.com/2013/01/looney-gas-and-lead-poisoning-...
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