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TIL of the Chain Test. For an arch to stand, it must fit into the mirrored shape generated by a chain.

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njgo TIL There is a 5000 year old, still undeciphered, language with over 1200 symbols.
ADRvl TIL Anne Frank's diary entered the public domain the same day as Hitler's Mein Kampf. And that a copyright dispute still swirls around the diary.
WkWg8 TIL during various historical periods, competing instrumentalists tried to produce a more "brilliant" sound, creating "pitch inflation". At the start of the 17th century, pitch levels became so high that singers had severe throat strain, and lutenists and viol players complained of snapped strings
nrEY TIL During a trip to Disneyland, David Rothenberg was drugged and burned alive by his father. He suffered burns on 90% of his body and survived.
d8K09 TIL "Seinfeld" composer Jonathan Wolff rewrote the theme song for every single episode. He says, "The bassline is so simple it can start and stop for his jokes, hold for laughs, and that way I could architect each piece of music for each monologue, Lego-style.”