http://www.history.com/this-day-in-history/gm-engineers-discover-that-leaded-gas-reduces-knock-in-auto-engines - discu.eu

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Leaded Gas Was a Known Poison the Day It Was Invented | Smart News| Smithsonian Magazine https://www.smithsonianmag.com/smart-news/leaded-gas-poison-invented-180961368/ 399 comments

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