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TIL the average Philadelphian consumes twelve times as many pretzels as the national average

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kj7d TIL Isaac Asimov refused the invitation to visit friend and famed A.I. pioneer Marvin Minsky’s lab at MIT in the 1960s because he was “Writing about really intelligent robots of the future and was sure that if he came and saw the clumsy ones that we were making it would spoil his imagination.”
D17Wp TIL the process of dry cleaning was invented in 1821 by an African American business owner named Thomas Jennings. He was one of the first African Americans to be granted a patent. He had to use the proceeds from his invention to buy his wife and children out of slavery.
BrBwD TIL In the Strepsiptera the forewings evolved into halteres while, in the Diptera, the hindwings changed into halteres. Halteres have evolved at least seven times in insects, and in most cases it is known to be associated with improved manoeuvering in flight.
NXW8 TIL that pornstar Lisa Sparks holds the world record for having sex with the most partners in one day, which she achieved by copulating with 919 men on October 16th, 2004.
VMDOm TIL that Vinegar Valentines Were Mean-Spirited and Insulting Cards That Came to Popularity in the Victorian Era For Sending to An Unwanted Suitor or Someone You Didn't Like