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TIL of the Rosenhan Experiment, in which a psychologist David Rosenhan and seven other pseudo-patients faked their mental illnesses and gained admission into various psychiatric hospitals, as a criticism of the methods of psychiatric diagnosis.

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egZg TIL that in 2011 the head of the American College of Surgeons was forced to resign after he wrote a Valentine’s Day editorial touting the mood-enhancing effects of semen on women during unprotected sex, which was completely supported by the research he cited in said editorial.
p8y9A TIL Roman salt-making entailed boiling the seawater in large lead-lined pans. Salt was used as currency in ancient Rome, and the roots of the words "soldier" and "salary" can be traced to Latin words related to giving or receiving salt.
N901 TIL Famed dentist Painless Parker (who wore a necklace of teeth) & his Dental Circus lured naive patients by promising that the 50c extraction would be painless, or he’d pay $5. Screams of agony were drowned by a brass band while the audience was distracted, enjoying contortionists & dancing women.
8VwZ TIL An American believed to have been kidnapped since 2004 was discovered this year to be living in North Korea with a wife & 2 kids, where he teaches English.
RKDQ TIL Dolphins can communicate with one another over a telephone, and appear to know who they are talking. In one experiment carried in an aquarium in Hawaii, the mother and her two-year-old calf in another tank, connected by a special underwater audio link, recognized each other and “talked”.