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TIL that the Haber-Bosch process (involving formation of ammonia from nitrogen and hydrogen) that has led to a population boom over the past century, is also responsible for deaths of millions in the WWII. Additionally, almost 50% of the nitrogen found in human tissues originated from this process.

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16pl8 TIL the UK tradition of Fish and Chips was introduced by Spanish and Portuguese Jewish immigrants in the 16th century. It was created to allow Jews to safely eat fish cooked for Friday night dinner the following day on the sabbath, the day Judaism forbids cooking with fire or electricity.
8aol8 TIL of a very convincing theory suggesting that declines in lead exposure and lead in gasoline among the public in the U.S. and elsewhere since the 1970s has correlated with pronounced wanes/decreases in violent crime since 1990.
vKLx TIL in the 80’s Bayer sold contaminated blood products after safer versions became available. Although the product was tainted with HIV, a concern discussed by Bayer and the FDA, there was an impression of protecting the companies’ profits at the cost of infecting large numbers of people with HIV.
e0a4 TIL New Ant Species Discovered in the Amazon Likely Represents Oldest Living Lineage of Ants
R75P6 TIL of Adrian Carton de Wiart a British Officer who served in 3 wars; was shot in the face, head, stomach, ankle, leg, hip and ear; survived 2 plane crashes; tunneled out of a POW camp; tore off his own fingers when a doctor refused to amputate them. He wrote in WW1 "Frankly I had enjoyed the war."