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TIL of the condition Hikikomori which is seen among the youth of Japan and is also seen in UK, US, etc. Hikikomoris are reclusive adolescents or adults who withdraw from society and seek extreme degrees of isolation and confinement. It is estimated that there are about a million hikikomoris in Japan

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MoZV TIL 10-18 million Africans were taken by Arab slavers. This is more than the 12 million Africans shipped in the Atlantic slave trade, and 16-30 times more than the 600,000 slaves imported to America since 1620, which is less than the more than 1 million whites enslaved by Ottoman vassals.
kOpA5 TIL that “moonbows” are a natural phenomenon that occurs when (1) the moon is close to full, (2) rain is falling opposite the moon, and (3) the moon is low. Since the moon is the only source of light, the lunar rainbow will appear monochromatic to the naked eye. (More links in comments)
PyxO TIL: Mario Party 8 was withdrawn from shelves in the UK because some copies included the word “spastic”, which is considered a highly offensive word referring to disability, the game was eventually re-released with the word replaced with “erratic.”
M766A TIL that in 1929, Jimmy Doolittle made the first flight using only instruments, with the cockpit windows blacked out. Proving pilots could fly “blind.” This paved the way for modern aviation. He later led the famous 1942 Doolittle Raid, the first U.S. airstrike on Japan in WWII.
Yg9r TIL in Britain, more people believe in aliens than in God.