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TIL Human were naturally lactose-intolerant. Tolerant people emerged in Europe starting several thousand years ago while people of Africa, Middle East, and Asian remained intolerant.

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1a7G7 TIL that the Soviets used mobile gas chamber vans to execute groups of counter-revolutionaries during The Great Purge of the 1930's
jNw1E TIL Bill Murray hired an assistant who 'was profoundly deaf and spoke only in sign language' to make communication as difficult as possible between him, the director and the studio during the filming of 'Groundhog Day'
ZpKka TIL Larry Bird Once Played A Game Mostly With His Left Hand Because He Wanted to Save His Right for the Next Game Against the Lakers.
WNAB TIL that Versailles’s over 2000 fountains consumed more water per day than the entire city of Paris. To solve the water shortage, the fountaineers would signal each other upon the king’s approach to turn on the fountain. Once the king passed the fountain, it would be turned off again.
7rMjM TIL that when Mt. Everest was found to be the tallest mountain on Earth at 29000ft (the estimate at the time), an extra 2 feet were added on top of the number because they feared if it was too round of a number, the public would think they had picked an arbitrary number.