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TIL Claude Monet had Aphakia (the absence of an eye lens) in his later years, after two operations to remove his cataracts. The procedure enabled him to see ultraviolet light (400–300 nm). [Link in comments]

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a8Ney TIL that after the Papal States were lost and Rome was annexed to Italy in 1870, the Pope became a self-imposed prisoner within the Vatican. This situation lasted until the Lateran Treaty in 1929, which established Vatican City as an independent sovereign entity.
Z8M0p TIL avocados must be picked to ripen, can stay on the plant for 7 months as "storage" , and take 13 months to grow a mature avocado.
NX5Ve TIL Why do sailors use knots as a unit of speed rather than miles per hour
E1Mbx TIL That Frogs Can Be Hypnotized by Placing them on Their Backs And Rubbing Their Stomachs
AD1Bg TIL: That the old mnemonic of "Red touches black, it’s a friend of Jack" for coral snakes isn't reliable.