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TIL John F. Kennedy’s Eternal Flame has only ever gone out twice since 1963. The first time was less than a month after it had been lit when a child accidentally extinguished it with holy water. Luckily one of the grave workers was a smoker and had a lighter on hand to relight it.

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QJPxk TIL In October 1986 Soviet submarine K-219 suffered an explosion and sank in the mid Atlantic with an estimated 30+ nuclear warheads aboard. The cause for this explosion is contested to this day.
6x6w TIL barcode readers actually scan the white parts and not the black parts
x6eAD TIL: When someone with a bone marrow transplant takes a DNA/ethnicity test, their results typically include the results of their donor. This is called genetic chimerism.
O4JR TIL the Bat'leth (a Klingon sword from Star Trek) is classified as a weapon and has been used in several real-world crimes
kOnRE TIL despite graduating magna cum laude in 2007 with a 3.8 GPA, J. Cole officially received his degree in a homecoming concert in 2015 due to money owed for a library book.