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TIL cracking your knuckle joints doesn’t give you arthritis. Dr Donald Unger cracked the knuckles on his left hand, twice a day for 50 years but not on his right hand. He proved his mother wrong and received the Ig Nobel Prize for his research

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nWl5o TIL the astronauts from the 1st moon landing were quarantined with mice for two weeks. If the mice survived, the astronauts would be let out
aJrb TIL Mike Tyson offered a zoo attendant $10,000 to open the cage of a bullying gorilla so he could “smash that silverback’s snotbox.” His offer was declined.
9YVpr TIL first editon of “Harry Potter and the Philosopher's Stone” in USA got changed into “Sorcerer’s Stone” instead. Because a scholastic thought that "Philosopher" sounded too archaic for Americans, Rowling later said that she regretted this change
l7J7 TIL that a 1944 opinion poll in the US found that 13% of the public were in favor of “killing off” all Japanese: men, women, and children.
8aMY8 TIL that even the Ku Klux Klan classifies the Westboro Baptist Church as a hate group; the KKK were one of the main counter protesters against the Church's anti-Memorial Day protests at the Arlington Cemetery, Virginia