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TIL psychopaths are immune to the sympathetic, contagious yawn response. Additionally, researchers found that those resistant to the 'contagious yawn' were also resistant to being startled.

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r56W TIL The former Iranian president has returned to his original profession, teaching and now takes the bus to work every day
KOGW6 TIL Costco purposefully designed their store without signs to force people to wander through all the aisles and find things to buy.
awDmL TIL William Shatner developed tinnitis after an explosion on the set of 'Star Trek.' He coped with the condition by wearing a white noise device, which diminishes the physiological response to repeated stimuli. He became the official spokesman for tinnitis and talked someone down from suicide.
JkE8 TIL: Coyotes have mutualistic hunting relationships with badgers, assisting each other in digging up prey. They are such close friends that some coyotes have been seen laying their heads on their badger companions or licking their faces without protest.
6XRl TIL when universal health insurance was passed in Saskatchewan-Canada, doctors were so opposed to it they striked for 23 days.