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TIL the Soviet Tu4 was a reversed-engineered copy of the US B29 bomber. Copied to such detail that every Tu4 had a rivet hole in one wing exactly where an unknown Boeing engineer mistakenly drilled it in the B29 used as a template.

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xVBN0 TIL the word 'Silhouette' is derived from the finance minister of France who advocated a simple life.
ZpMDa TIL of a Dry Bite, a bite by a venomous animal in which no venom is released due to a number of reasons. The phenomenon can be misinterpreted as evidence for the effectiveness of supposed miracle cures.
mxgAo TIL Meriwether Lewis was the first naturalist to encounter grizzly bears firsthand. His terrifying accounts became the new standard scientific description of the species. Naturalist George Ord used these firsthand descriptions to name the bear *Ursus horribilis Ord meaning Ord's horrible bear
7G9M TIL Harvard researchers were able to store 700 terabytes of data on a single gram of DNA.
KOD94 TIL there are no such thing as true wild horses any more. The Western US has a population of free-roaming horses that are descendants of domesticated Colonial Spanish horses and are thus technically feral not wild.