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TIL that the Great Wall of China, stretching over 20,000 km (13,000 miles) and built over centuries, never effectively prevented invaders from entering China.

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Wk7kL TIL the Creole pig of Haiti was deliberately exterminated in the 1980s to stop an outbreak of African swine fever. Peasants were provided with imported pigs from the U.S. as compensation, but this caused many of them to lose money as the American pigs were much more expensive to maintain.
v1y0L TIL that the Stanford Prison Experiment, the infamous experiment that many psychological works reference, was actually mostly a fraud and that many of the participants were faking.
WkJ5L TIL when Kylie Jenner tried to trademark her name Kylie™ in 2016, Australian pop star Kylie Minogue successfully got the request blocked, with her lawyers telling the US government Kylie Minogue is “internationally renowned” while Kylie Jenner is a “secondary reality TV personality.”
KYoaR TIL As part of a promotional campaign by Sega in the early 2000s, Fred Durst signed several Dreamcast consoles and battled other players in a UFC game. The campaign featured a magazine ad with a cartoon Fred Durst saying, "If you get your ass kicked, it's probably me on the other end of the line."
8ae4 TIL in 2003, the “Infinite Monkey Theorem” was tested. Six Macaques were left with a working computer keyboard for a month. They produced six pages of mostly the letter “S” and a bashed-in keyboard covered in Macaque urine and feces.