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TIL Goodhart's Law, the principle that when a measure becomes a target, it ceases to be a good measure. For example, when a government tries to bring down unemployment figures to demonstrate how well the economy is doing, unemployment figures stop being a good measure of the economy.

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VMGkG TIL Stamps are considered a financial liability until they are used, so buying stamps does not provide the United States Post Office with more revenue. Only after the stamps are used can they be credited for revenue.
8ax7V TIL that the inventor of Coca-Cola, John Stith Pemberton was a Civil War veteran who became addicted to morphine due to pain from a saber wound to the chest. Seeking alternatives to his morphine use, he developed the original formula for Coca-Cola with use of the coca plant for pain relief.
woYAW TIL that Canadian Pacific Air Lines Flight 21 crashed due to an explosion that has yet to be solved after 57 years. All 52 passengers and crew members died.
R7g44 TIL supermodel Kate Upton’s great grandfather was the co-founder of Whirlpool Corporation and the inventor of the first mass produced electric washing machine.
9w0NG TIL of Li Tobler, an actress and model who dated H.R. Giger and was the inspiration for many of the women in his art.