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TIL in WWI the Secret Service discovered that semen was found to be useful as invisible ink with the motto "Every man his own stylo." It was eventually discontinued because of the smell.

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RKN7 TIL Google searches for ‘Tinder’ peak at 12.30am, 'porn’ at 1.30am and 'lonely’ at 2.30am
X0VVj TIL: Before the invention of the paint tube in 1841, oil paints used to be stored in pig bladders. The artist would prick the bladder and squeeze out the amount of paint they needed.
x6yg1 TIL myalgic encephalomyelitis / chronic fatigue syndrome (ME/CFS) has an economic impact of 36–51 billion dollars per year in the USA, yet historical research funding is far below that of comparable diseases
GYWeG TIL that New Orleans city lifeguards threw a party to celebrate a season with no drownings. After the party, it was discovered that someone had drowned, despite there being at least 100 lifeguards present, 4 of whom were on duty during the party.
OoN94 TIL The chief of security of the company hired to organize and promote McDonald's giveaways, stole almost all of the top prizes between 1995 and 2000. The scam netted over $24 million. The trial began on September 10, 2001, but was overshadowed in the media by the September 11 attacks.