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TIL When a patient is zapped with a defibrillator, their heart stops beating altogether - the two electric paddles attached to the patient's chest essentially 'reset' the heartbeat. Once the heartbeat stops, the heart starts afresh and begins beating normally again.

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g4Y9 TIL that Mark Zuckerberg, billionaire and CEO of Facebook, puts tape over his webcam. FBI director James Comey also tapes over his webcam and the American digital rights group EFF sells webcam stickers.
DQ4yD TIL that the modern doorknob was invented in 1878 by 16 year old African American inventor Osbourn Dorsey
9LXQ TIL that a physicist made his cat the co-author of his scientific paper to avoid replacing “we” with “I” throughout his paper.
yQVbl Let’s ask Betsy Dresser, the senior vice president of research at the Audubon Center for Research of Endangered Species in New Orleans, who has raised several litters of small African wildcat clones. “Oh yes, the clones are very much wild animals with wild instincts,” she says. “They bite and scratch. You can’t handle them without gloves and nets.”
v11aB TIL Scientist Anatoli Petrovich Bugorski survived being shot in the face by a particle accelerator beam