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TIL before 2001, on 9/11 four aircraft crashes and 1 disappearance happened in different years, resulting in 221 deaths and 16 missing combined

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mxx9P TIL There are four different types of OCD. One of them is checking. The checking is often carried out multiple times, sometimes hundreds of times, and for hours on end, resulting in the person being late for work, dates and other appointments.
E1djV TIL Goya's most well known painting, Saturn Devouring his Son, was not described or named at all to the public by the artist himself. The name was given later on due to it resembling the mythological event. For all we know, it could not be Saturn at all, but just someone eating another person.
a8BgL TIL the smoot is a unit of measure named for Oliver R. Smoot, an MIT student who as a fraternity pledge was forced to measure the Harvard Bridge using himself as a ruler. A smoot is equal to five feet, seven inches.
RZ84 TIL That the ACT and College Board (SAT) sell student information, netting these companies millions of dollars each year.
KY0jG TIL that financial mathematicians have calculated how expensive a liability policy for a nuclear power plant would be: €72 billion a year