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TIL Richard Feynman volunteered for hypnosis on two occasions and wrote about it. During one demonstration he decided to disobey the hypnotist’s suggestion but wasn’t able to because he suddenly felt uncomfortable

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m10xp TIL of the curb cut effect, which describes the phenomenon of accessibility features designed for the disabled benefitting those without a disability. An example is many hearing people used closed captioning.
P1W6w TIL Nitrogen bubbles in the synovial fluid get trapped then released from moving joints and stretches, causing painless noises. Crepitus is harmless when not caused by an injury, medical condition or disease
gMmN4 TIL under Director J. Edgar Hoover, FBI agents were directed to seize all pornographic materials uncovered in their investigations and forward them to Hoover personally. He reportedly used them for his own titillation and as blackmail.
Y7xKZ TIL in 2020, a diner in Denver, Colorado had "Stupid questions" listed as a side on their menu for 38 cents and some customers would purposely ask stupid questions to get the charge added to their bill.
p8kgO TIL Grover Cleveland placed his first (illegitimate) child into an orphanage and had the baby's mother committed to an insane asylum in order to cover up the scandal.