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en.wikipedia.org/wiki/Cracking_joints

The act of cracking joints means bending a person's joints to produce a distinct cracking or ... According to a folk belief, the popping of joints, especially knuckles, leads to ... "Why knuckle cracking makes a popping sound, and why it might be ...

health.howstuffworks.com/human-body/systems/musculoskeletal/question437.htm

If you've ever laced your fingers together, turned your palms away from you and bent your fingers back, you know what knuckle popping sounds like. Joints ...

articles.mercola.com/sites/articles/archive/2014/11/08/cracking-knuckles-harmful.aspx

Nov 8, 2014 ... When you “crack” your knuckles, or any other joint, it expands the space between your bones, creating negative pressure that draws synovial ...

www.loc.gov/rr/scitech/mysteries/joint.html

Your joints can make a variety of sounds: popping, cracking, grinding, and snapping. The joints that "crack" are the knuckles, knees, ankles, back, and neck.

www.scientificamerican.com/article/what-makes-the-sound-when

To understand what happens when you "crack" your knuckles, or any other joint, first you need a little background about the nature of the joints of the body.

www.sciencenewsforstudents.org/article/mystery-solved-why-knuckles-crack

Apr 22, 2015 ... ... puzzled over what makes that loud sound when our knuckles “crack. ... being able to crack your knuckles could be a sign of healthy joints.

www.ask.com/youtube?q=What+Makes+Your+Knuckles+Crack%3F&v=n3IYmdy6d4Y
Mar 9, 2015 ... One man cracked his knuckles in one hand for 60 years and not the other. Watch the ... I hate this sound, it makes me so uncomfortable .

www.washingtonpost.com/news/speaking-of-science/wp/2015/04/15/scientists-finally-figure-out-what-makes-your-knuckles-crack

Apr 15, 2015 ... GOOD NEWS. Scientists think they know what makes knuckles crack. I know, right? How did we not know that already? It turns out the subject ...

www.medicalnewstoday.com/articles/259603.php

Jun 21, 2017 ... There are various reasons why joints make a 'cracking' sound. The cracking of joints ... Does cracking your knuckles cause arthritis? Cracking ...