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TIL of Heinz Drossel, a German soldier who married the first Jew he rescued in WWII; a woman he stopped from committing suicide. Risking execution, he sheltered her in his apartment before giving her money to find a safer place to stay. Heinz went on to rescue more Jews.

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X0VAX 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.
n91G TIL that about 50% of the earth’s heat is generated from radioactive decay from elements such as uranium and thorium
4XD6g TIL that the US gave hallucinogenic drugs to soldiers to make sure they are prepared to exposure to chemical warfare. Between 1955-75 the army used 7,000 volunteer soldiers to test LSD, nerve agents, irritants, and blistering agents. Some volunteers were asked to workout & do math while on LSD.
MeMdA TIL that Amelia Earhart and Eleanor Roosevelt once commandeered an airplane and went on a joyride to Baltimore. They did that after sneaking out of a White house event.
8aPG4 TIL that one of the conspirators of Franz Ferdinand's assassination swallowed a cyanide pill and jumped into a nearby river after a failed attempt to kill Ferdinand. The cyanide pill was expired and only made him sick, and the river was only 10cm deep. He was detained seconds later by authorities.