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TIL that no song debuted at No.1 on the Billboard Hot 100 charts for 40 years, until 1995 - when it happened 4 times.

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P1MEZ TIL the score for the 2019 documentary 'Apollo 11' was made using instruments which were only available at the time of the mission in 1969.
4XQ06 TIL that in 2020, the first quantum chess tournament was played. In quantum chess, there are multiple boards on which the pieces exist, and any quantum move creates a superposition of boards. In order to determine where the entangled piece is actually located, a player must make a measurement
x6lv5 TIL Mafia receipts account for 9% of Italy’s GDP. The ‘Ndrangheta alone account for 3%.
4XGYN TIL that deer in India (who are red-green colorblind) take advantage of the better-sighted langur monkeys by staying near them and learning the monkeys' alarm signals for when they spot predators which are dangerous to the deer.
9wWDG TIL that cigarette filters were designed with color-changing chemicals to give the illusion that they filter out toxins. In reality, the filters have little to no health benefits.