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TIL that the trail of Lewis and Clark can be partially tracked through the mercury left from their excrement

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vPgm7 TIL there's a "femme fatale" firefly (photuris) that lures in males of other species by mimicking their mating flashes and then eating the poor, unsuspecting fools
M7pPB TIL: about Nüshu, a chinese script exclusively used by women, that was almost lost after texts were destroyed during the Cultural Revolution.
e0dk TIL that Andy Hallet, “Lorne” in “Angel”, died at the age of 33 from congestive heart failure brought on by lasting weakness from a dental infection years earlier.
awLLN TIL that a American Airlines DC-10 in 1972 had it's cargo door ripped off and caused the floor of the plane to collapse. The crew guided the plane to safety.
W7BG4 TIL Marco Polo's father and uncle, Niccolò and Maffeo Polo, preceded him in China and meeting Kublai Khan by several years. Because of this early voyage, Marco did not meet his father or uncle until he was fifteen years old.