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TIL the earliest known site of human habitation in North America (at 19,000 years old) is a short drive from Pittsburgh, Pennsylvania. It was discovered in 1955 because of a groundhog hole.

Read more heinzhistorycenter.org

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XEbEk TIL newborn kangaroos are about the size of a jelly bean
4XJAX TIL that the first full-length full-color film was an American historical drama "Becky Sharp", directed by Rouben Mamoulian in 1935. It was shot on 3-strip technicolor cameras that captured separate color records onto three strips of film.
j6r4N TIL the term “Blowing Smoke up your ass” has its roots in life saving science.
BZrW TIL that transparent aluminum, which has existed since 1981, can stop a .50 caliber bullet.
P8BO TIL Salmon are pink because of their primarily crustacean diet