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TIL The first email was sent by a young engineer named Ray Tomlinson to himself in 1971. He was simply "fooling around" for something to do with ARPANET - a network that connects various research organizations in United States. That curiosity led to his induction to Internet Hall of Fame on 2012.

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nA9B TIL that Thomas Jefferson impregnated one of his slaves, and then enslaved his child. (And quite possibly five more)
8B6Z TIL that to demonstrate the m1917, John Browning fired the machine gun for 48 minutes straight (~21000 rounds). The US army shortly after adopted it as its standard machine gun..
9LxQ TIL there are three times as many atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
R59vl TIL of Beauty Parlor Stroke Syndrome, a type of stroke that can occur due to poor neck posture, such as when getting your hair washed at the beauty salon.
ADm07 TIL of the old adage: “Red sky at night, sailor's delight. Red sky in morning, sailor's warning". By basing the color of the sunset/sunrise one can tell of the weather conditions for that day/night.