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TIL a scene in the 1991 film "Frankie and Johnny" called for Al Pacino's character to be surprised after opening a door. In order to elicit genuine surprise, the director arranged for William Shatner and Leonard Nimoy, to appear behind the door (out of shot) in full Starfleet uniforms

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GAAL4 TIL male testicles are always visibly moving due to responses to temperature and arousal changes.
kEMg TIL that during the 1800s, some artists created beautiful and intricate patterns using algae under a microscope. They are called diatom arrangements.
d89d7 TIL Churches in Europe once employed “dog whippers” who would whip unruly dogs on church grounds during services. They also popped sleepy parishioners on the head in England.
VBG7Q TIL that the BlueSky social media network has the same name as its current CEO, Lantian "Jay" Graber, whose first name means "blue sky" in Mandarin
8k18 TIL that Earth has sent out a radio signal towards a possible life-containing exoplanet named Gliese 581c. It is supposed to reach the planet by late 2029.