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TIL Transparent glass solar panels are already a reality

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P17yV TIL Tooth brushing only became widespread in the US after WWII, when returning soldiers continued the practice that had been required during their military service
Lk1np TIL in 1985 the Pittsburgh Pirates’ mascot acted as a middleman between cocaine dealers and the Pirates’ players. He delivered the coke to the stadium and completed the deals with players there. He also frequently was high while dressed as The Pittsburgh parrot during the game.
M7kW7 TIL about Connie Converse, an American singer-songwriter, active in New York City in the 1950s. Her work is among the earliest known recordings in the singer-songwriter genre of music. In 1974 Converse wrote letters to family, left her home and was never heard from again. Her fate remains unknown.
erA4 TIL nobody climbed Mount Everest in 2015. First barren spell in 41 years.
BgEYK TIL pilots in the 30s-40s navigated their aircraft using Morse code. The "low-frequency radio range" navigation system played letter A to tell pilots to turn left, N to turn right, and a steady tone to go straight. Pilots listened to Morse code for hours. It was prone to giving wrong directions.