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TIL Grapefruits grow in clusters like grapes, hence their name.

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0dXWL TIL of the United Kingdom's Locomotives Act 1865, which mandated that motor vehicles abide by a 2 to 4 mph speed limit, be crewed by minimum of three persons, and have man walk at least 55 meters ahead of the vehicle, waving a red flag and sounding a horn.
rN4Qx TIL that the first use of an external defibrillator was on a 14-year-old boy in 1947. These early defibrillators used alternating current that was transformed from 110–240 volts available in the line, up to between 300 and 1000 volts, to the exposed heart by way of "paddle" type electrodes.
j676M TIL that Yolanda King (the eldest daughter of MLK JR.) was worried when meeting Attallah Shabazz (the daughter of Malcolm X) they wouldn't get along because of their father's legacies. They found common ground and created "Stepping into Tomorrow" a play about the issues their father's fought for.
WMPX TIL Patrick Stewart left his bags unpacked for the first six weeks of filming Star Trek: TNG because he thought the show would fail.
LQ66p TIL In 1994 the athlete Mauro Prosperi got lost in the Moroccan desert during a marathon, he survived by eating roots, hunting beetles,snakes and drinking his urine for 10 days