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TIL that sperm don't actually swim, they corkscrew!

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6lLw TIL CIA created a gun that could shoot darts that caused heart attack. Upon penetration of skin the dart left just a tiny red dot. The poison itself worked rapidly and denatured quickly afterwards. It was revealed in 1975 in a Congressional testimony.
KOvy6 TIL that the worlds tallest people and worlds shortest tribe happen to be in countries that border each other.
QJVxe TIL the Premier league and other professional football leagues use an algorithmic method of measuring possession percentage during a game. It is not based time spent with the ball, but rather on the number of passes completed.
1aRY4 TIL The flag of Bikini Atoll closely resembles the USA. It is a symbolic reminder of islanders' belief that a debt is owed by USA to their people, because the US government detonated the Castle Bravo hydrogen bomb on the island in 1954.
OJ1R TIL that when astronaut Ron McNair was 9 he attempted to check out books from a segregated library the librarian called the cops and his mother. The police however supported his right to read.