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TIL : Pacemaker was an accidental discovery by Wilson Greatbatch. Working on a heart-rhythm recorder, he mistakenly added an incorrect electronic component, so that the device produced electrical pulses instead of simply recording them.

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DoAP TIL in the Middle Ages and Renaissance, the color of clothing showed a person’s social rank and profession. Red could only be worn by the nobility, brown and gray by peasants, and green by merchants, bankers and the gentry and their families
VM8y4 TIL that in 19th century England, if your corpse wasn’t claimed in a hospital or if you died in a place where you couldn’t be identified, you might have been sold to a school or hospital so doctors could practice anatomy. Some priests even sold bodies to gravediggers who sold them to hospitals.
ZK5G TIL an Indian flight attendant hid the passports of American passengers on a hijacked flight to save them from the Islamic terrorists. She died while shielding three children from a hail of bullets.
DQxwv TIL that refrigerated bread isn't hard due to moisture loss but crystalized starch which can be fixed by simply heating it up.
9YREp TIL that there is a thing called the "sweater curse." Some knitters believe that knitting a sweater for a signifcant other and giving it to them as a gift will result in a breakup. A 2005 poll found that 15% of knitters have experienced it firsthand.