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TIL... Of First and Second Sleep.In the early 1990s, psychiatrist Thomas Wehr conducted an experiment in which a group of people were plunged into darkness for 14 hours every day for a month.They slept first for four hours, then woke for one or two hours before falling into a second four-hour sleep.

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wLRgP TIL about a mutation in the ADRB1 gene that affects sleep. People who inherited one copy of this mutant gene had a shortened sleep cycle, sometimes requiring only 4.5 hours of sleep per night.
5YbE8 TIL that Richard Donner received hate mail and death threats for making Superman (1978), which draws parallels between Superman and Jesus, with one letter telling him his "blood would run in the streets".
0wgZ5 TIL only one woman has been awarded the Medal Of Honor. It was subsequently taken away from her & then 60 years later, it was posthumously given back. Mary was a women’s right activist & was once arrested for “impersonating” a man by wearing pants.
e0e5n TIL that Eric Harris and Dylan Klebold (the Columbia High School murderers) actually were bullied in high school, including an incident in which they had a cup of shit thrown at them and another in which a group of students gathered around them and covered them in ketchup
0wPAR TIL Each year, approximately 60,000 Spanish Galgos (hunting dogs) are abandoned or tortured to death in Spain. By tradition, the dogs are often killed by hanging them by their necks with their feet just touching the ground. The more they suffer the more successful the following hunting season willbe