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TIL That according to some Astronomers the best way to view the Earth and the Moon is not as a planet and a satellite but as a binary planet system

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GY77g TIL butterfly knives originated in the Philippines after WWII as a product marketed to American soldiers.
yAQa TIL Hitler, Trotsky, Tito, Freud and Stalin all lived in the same place, Vienna, in 1913.
D1R1g TIL October Sky is an anagram of Rocket Boys, the original name of the source memoir.
l7JXA TIL that more men than women are colorblind, not because knowing colors is considered a feminine trait, but because it is a sex-linked gene. Colorblindness is a recessive trait on the X chromosome, so men only need one bad X to be colorblind, whereas women need two.
p8Abb TIL the Chinese besieged Alexandria Eschate, on of the cities that Alexander the Great had founded during his campaign. The city was attacked by the order of the emperor Wu Han in 102 B.C. and its capture stabilized Chinese expansion in the West contributing to opening up the Silk Road later on.