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TIL to gaslight someone, meaning to make one think they're going crazy, comes from the movie Gaslight (1944), where a husband tried to make his wife (Ingrid Bergman) think that very thing by dimming the gas lights in house and making her think she was imagining it.

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Vy6p TIL a mule is not just the offspring of a donkey and a horse, but more specifically the offspring of a MALE donkey and a FEMALE horse. The other way around is much rarer: a ‘Hinny’
XEmPr TIL the total weight of all the ants on earth is the same as, if not greater than the total weight of humans on the planet
ebEg TIL that in 1842, Joseph Smith, founder of Mormonism, became a Mason. Shortly thereafter, he introduced a “sacred” temple ceremony to the Mormons (still in use today) which borrowed heavily from the Masonic initiation ceremony.
KYKYQ TIL There is an urban legend in BC, Canada, that driving examiners are expected to fail 50 per cent of the people they test. Nearly 50 percent of driving test candidates fail the first time because many arrive ill-prepared or with the intention of using their first test as a learning tool.
p8kxQ TIL of Gan Ying, a Chinese envoy who in 97 AD was sent on a diplomatic mission to Rome. He would turn around in Mesopotamia, discouraged by sailors who gave him a lengthy estimate on a sea voyage. Unknown to him Parthia shared a land border with Rome, which was only a months travel away from him.