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TIL Maiko are apprentice Geisha and undergo incredibly rigorous training.

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5YMDQ TIL An instrumental version of the song "Sukiyaki", a story of a man who looks up and whistles while he is walking so that his tears will not fall, was played by NASA over the radio for the Gemini VII astronauts as mood music, thereby becoming one of the first pieces of music sent to humans in space
R7g6a TIL that there was extensive research into a cigarette that wasn’t as cancerous, but the project was scrapped just before mass production because of threats by another Tobacco company
5Yn49 TIL Houston officials let developers build thousands of homes inside reservoirs. Nobody told homebuyers that the reservoirs were designed to flood during major rainstorms until Hurricane Harvey happened.
pYYmZ TIL that caffeine’s half-life is almost doubled in women taking oral contraceptives.
gwEb TIL of the Mantis Shrimp. It can “punch” with a force of 1500 N and at speeds of 102,000 m/s. This “punch” collapses air bubbles, creates a reaction as hot as the sun, and can kill bigger prey with just the shockwave it produces. It is also monogamous with it’s mate for 20 years.