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TIL of the Guinea Worm. In 1986, it infected 3.5 million people . Now it is down to 2 cases in 2016. It stands to be the second globally eradicated infectious disease in history, after smallpox.

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xVLZw TIL that the city of Ontario, Oregon during WWII allowed Japanese Americans to settle in the city at the time when much of the West Coast supported their exclusion, and helped them escape internment camps. All thanks to then-mayor Elmo Smith.
G601 TIL the song Fly Me to the Moon was the first music ever heard and played on the Moon, when Buzz Aldrin played it on a cassette tape.
D1pyp TIL Scientists found cancer in a 1.7 million year old foot bone and a 2 million year old spine from two ancient hominin specimens in South Africa. Before these finds, the oldest dated cancer in a human was only 120,000 years old.
D1vGY TIL humans make more than 9000 gallons of pee in their life time
9j9X TIL in 1851, we had measuring tools with a precision of one millionth of an inch.