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TIL that the colors of the barber pole are red, white, and blue to represent the medieval role of barbers. The red represents the blood from bloodletting, the blue represents the vein that was cut, and the white represents the bandage. It spins to represents the blood flowing down.

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7DV7 TIL a man survived Nazi Doctor Josef Mengele removing his kidney without anesthesia and survived a gas chamber as he was the 201st person in line for a chamber of 200 people.
Q54L TIL on Wall Street at noon in 1920 a horse drawn carriage loaded with explosive went off killing 38 people and injuring hundreds. Never solved it was expected to have been Italian Anarchists
jNgbj TIL that although Hong Kong has a lower total population density compared to Singapore (6,780 vs 7,792 per square kilometre), its net population density (i.e. the density of developed land) is twice as high (22,000 vs 11,000)
E17LW TIL that skateboarding was so uncool that Tony Hawk had to hide his skateboard at school so that he wouldn’t get beat up and bullied.
0dW9N TIL that despite living under Jim Crow, Percy Julian was a doctor who pioneered the drug industry. After he developed the chemical synthesis of hormones like testosterone & progesterone, he became the first African American chemist inducted into the National Academy of Sciences.