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TIL that Mythbusters were going to do an episode which highlighted the immense security flaws in most credit cards, but Discovery was threatened by, and eventually gave into immense legal pressure from the major credit card companies.

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RxR7 TIL that President John F. Kennedy used to keep a note in his pocket with the figure 118,574 - the number of votes he narrowly defeated Richard Nixon by.
xA61 TIL the rat poison/life saving human medication Coumadin was discovered after cows were observed eating clover and then bleeding to death.
kJlW4 TIL that serotonin, commonly linked to happiness as a neurotransmitter, has a surprising dual nature: it can be toxic. When injected into the skin, it causes severe pain and is a key component in wasp, hornet, and scorpion venom.
lowQ5 TIL that during the victorian era and the 19th century many people caught TB from cow's milk treated with borax that allowed the bacteria to flourish and hide the sour smell. Millions died.
9YBaG TIL of a city in the U.S. called George, Washington. The name was chosen by Charlie Brown, a local pharmacist, to honour the first U.S. president.