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TIL a 747 is made up of 6,000,000 parts

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KYw19 TIL Dry cleaning isn't dry at all and is only called dry because it uses chemical solvents instead of water
4meJ TIL of bank robber McArthur Wheeler. Because lemon juice can be used as invisible ink, Wheeler (wrongly) assumed that putting it on his face would make him invisible to the bank’s security cameras. He was caught later that day.
OoEKL TIL that it's illegal to sleep outside on a refrigerator in Pennsylvania.
1adyW TIL that Caesar salad was invented in Tijuana, Mexico, and contained whole lettuce leaves meant to be picked up and eaten with your hands
p8yGG TIL there's a debate about whether math was invented or discovered. Even though math is used to measure and predict and model, it's debated whether math is inherent to the universe or if math is just something we came up with to describe/measure/predict natural phenomenon.