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TIL the observation of the comet Kohoutek helped to support the "dirty snowball" hypothesis about the composition of comet nuclei. The comet was a disappointment to the public, however, because early projections for its brightness had been too optimistic.

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8aBpX TIL the definition of grams and kilograms have been flipped; the kilogram is the SI unit of mass, and the gram is defined as 1/1000th of a kilogram.
Wkk6o TIL President McKinley was reluctant to accept the security available to his office. His secretary feared an assassination attempt would take place during a visit to the Temple of Music (where McKinley was indeed assassinated) and took it off the schedule twice. McKinley restored it each time.
kJvME TIL there is a maid café in Japan where maids pretend to be your wives. Inside, a delicious home-cooked meal is ready on the table…oh, and she’s wearing a bikini. Also, the cafe in question is obviously still in operation today, after 7 years.
Bwgk TIL Sea Otters are known to hold hands in groups - called a raft - while they eat, sleep and rest, to prevent families losing each other while adrift on water.
nLNb TIL that the “ashes” you get after cremation is crushed bone, as the rest of the body (organic matter) vaporizes at the high temperatures.