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TIL of Barry Marshall who challenged the scientific consensus that ulcers were caused by stress. After being ridiculed and having his papers rejected in 1984 he infected himself with ulcer inducing bacteria and proved the scientific elites wrong. He subsequently won the Nobel Prize in Medicine

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YpXxd TIL Cheddar cheese wasn't the dominantly produced cheese in Britain until WWII, when cheese factories were forced to produce Cheddar due to its high yield per litre of milk; this was necessary due to the introduction of rationing.
xAbw TIL Bayer sold HIV and Hepatitis C contaminated blood products that caused up to 10,000 people in U.S.A alone to contract HIV. After they found out they pulled it off the shelves in the U.S. and sold it to countries in Asia and Latin America so they wouldn’t lose money from it.
5YBaR TIL The trivia (singular trivium) are three lower Artes Liberales: grammar, logic, and rhetoric. These were the topics of basic education, foundational to the quadrivia of higher education, and hence the material of basic education and an important building block for all undergraduates.
xne7 TIL in 2009, Bill Gates gave a presentation on mosquitoes and malaria. After he explained the severity of the disease and how it’s transmitted via mosquitoes, he ended his presentation by releasing a swarm of mosquitoes into the audience.
rN7EW TIL: The widely-reported study that men leave their wives due to illness more often than women leave husbands was retracted in 2015 because an error in the data analysis code classified "no response" from men as "choosing divorce" which rendered the original results invalid and skewed.