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TIL that, in 1948, a psychologist gave a group of his students a test that he said could summarise their personalities. Upon receiving their summaries one week later, the students gave them an average accuracy score of 85.2%. In reality, the students had all received the exact same summary.

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wpO8 TIL that a tiny (1sq. cm) transparent Australian jellyfish has venom delivering tentacles a metre long, and whose sting causes Irunkandji syndrome, which induces feelings of impending doom, severe pain, and cardiac arrest.
6pEm TIL in 1990, a 15 year old girl testified before Congress, describing how Iraqi soldiers killed babies in a Kuwaiti hospital. This helped stir US favor for the Gulf War. The girl was later found to be the daughter of a Kuwaiti ambassador, and her story fabricated by American PR firm Hill & Knowlton
0QLy TIL the longest recorded field goals in college football (69 yards) and high school football (68 yards) are each longer than the NFL’s professional record (64 yards).
mxxvE TIL Dean Norris, the actor who played Hank in Breaking Bad, was also in the original Total Recall (1990). He played Tony, the butt-faced mutant friend of 3 boob girl.
LkB80 TIL in the movie The Godfather, the horse head from the scene where Jack Woltz, played by John Marley, wakes up to find it lying in his bed, is from an actual dead horse. During rehearsals a fake one was used, and Marley wasn't told beforehand, so his screams during the actual shot were genuine.