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Why do your knuckles pop? - Eleanor Nelsen

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TEDEd Animation

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Some people love the feeling of cracking their knuckles, while others cringe at the sound. But what causes that trademark pop? And is it dangerous? Eleanor Nelsen gives the facts behind joint popping.

Here's a thought experiment: if you open one bottle of soda in a sealed room whose volume is 1,000 ft3, and another in a room whose volume is 5,000 ft3, which one would fizz more? Why?

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About TED-Ed Animations

TED-Ed Animations feature the words and ideas of educators brought to life by professional animators. Are you an educator or animator interested in creating a TED-Ed Animation? Nominate yourself here »

Meet The Creators

  • Director Steve Belfer
  • Animator James Jacob, Michelle Tessier
  • Educator Eleanor Nelsen
  • Sound Designer Cem Misirlioglu
  • Narrator Addison Anderson

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