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TIL there were American soldiers during World War II, who used fake tanks and pre-recorded sounds to deceive the Nazis into thinking their army was bigger than it actually was. They were called the ‘Ghost Army’.

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OGVZ4 TIL that in 2020, researchers tried to determine the actual effects of ingesting George's Marvelous Medicine (from the Roald Dahl book), consisting of shampoo, anti-freeze, brown paint, floor polish, and 30 other household items. It would cause vomiting, kidney injury, convulsions, and likely death.
yED8 TIL that radiation-blocking proteins taken from “water bear” DNA have been incorporated into human cells which boosted the protection of human DNA against damage from x-rays by 40%.
WKYY TIL Hot Pockets were originally called Chunk Stuffers
neNYW TIL that due to elephants with tusks getting poached, humans are literally causing natural selection from more elephants being born tuskless over the past decades.
bGB4 TIL the Ancient Greeks had a rudimentary railway c.600B.C