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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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GMr4 TIL “Texas” means “crazy” in Norway
5V1D9 TIL the echo effect used in Duane Eddy’s 1958 instrumental hit “Rebel Rouser” was achieved using a 2,000-gallon water tank the studio had purchased from a junkyard
p8vob TIL a man lived with a bullet in his head for five years after forgetting he was shot at party. When presented with the bullet, the man recalled he had received a blow to the head around midnight at a New Year's party 5 years prior but had forgotten about it because he had been "very drunk"
68D7 TIL That Ken Griffey, Jr. played With His Dad during the MLB season of 1990 –and in one game, Sr. and Jr. hit back-to-back home-runs.
v6A8 TIL the standard model of particle physics is so accurate, it describes almost everything in the universe to twelve decimal places.