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TIL Horseshoe Crab's are harvested for their blood, which is used for the detection of bacterial endotoxins in medical applications.

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5oaR TIL that Bobby Sands, a member of the Provisional IRA, was elected to British Parliament while in prison. He was never seated and died after 66 days of hunger-striking.
A9Dw TIL while Teddy Roosevelt was police commissioner in NY, he ordered about forty Jewish policemen to protect a German anti-Semitic preacher, with the goal to make him ridiculous.
x67Yw TIL that 16.3 million of the 16.4 million Americans who served in WW2 are dead
JYpDj TIL Skepticism is the longest typed word on the typewriter (or any keyboard )in which you alternate hands every letter and the word typewriter, is one of the longest words able to be typed using one row of letters.
p8m6O TIL that Russians call roller coasters "American Mountains" even though roller coaster are called "Russian Mountains" in many languages around the world