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TIL “knock on wood” derived from Pagans touching, tapping or knocking on trees believing they were the homes of fairies and dryads who would wake and bless them with luck.

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XE7gk TIL that South Pole so much colder than the North Pole because it sits on top of a very thick ice sheet, which itself sits on a continent. The surface of the ice sheet at the South Pole is more than 9,000 feet in elevation--more than a mile and a half above sea level.
nWknr TIL left-handed men are more likely to be homosexual than their right-handed counterparts
6PR7 TIL You Can 3D Print Any MP3 Into A Vinyl Record
lolKK TIL Cleveland, Mississippi desegragated its schools in 2016, 62 years after the US supreme court ruled that segragated schools are unconstitutional
b9N6Q TIL The sharpest usable knife blades are made from volcanic glass called obsidian. They are 10 times thinner than a razor blade but can’t be used for surgical instruments as they could shatter.