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TIL if you clap your hands at the base of a Chichen Itza pyramid, it makes a “bird” sound.

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ne0JG TIL early WWII torpedoes were so unreliable that on one patrol, the USS Tinosa fired 15 torpedoes with only 2 exploding. Earlier, the USS Sargo fired 13 torpedoes with zero successes.
4kkAJ TIL that Donald Duck has a twin sister named Della. First mentioned back in 1937, she did not make her animation debut until 2017. She is actually the mother of Huey, Dewey, and Louie.
X8XQ TIL that a business in Texas still uses a 1949 IBM 402 punched card computer. It still runs all of its accounting work (payroll, sales, and inventory) through the IBM 402.
OoyRR TIL that the world's oldest living drag queen is Darcelle XV who at age 88 is still performing at her namesake club that she founded in 1967 in Portland, Oregon.
Awwn TIL The size of the human genome is 3.2GB. The smallest known vertebrate genome is that of puffer fish (390MB), the largest is that of the lungfish (130GB).