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Cracking of the finger joints is caused by the separation of the joints and the formation of bubbles in the fluid that lubricates the joints. The bubbles are created as the carbon dioxide tries to fill the gaps between the joints created by stretching the fingers. If the joints expand too much, these bubbles burst and disappear – this is how we make sounds.
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01:49
Our bodies are right-side up, alkaline acids can dissolve alcohol, and bones are stronger than metal.
Many people enjoy making snapping sounds when they stretch or flex their fingers, although it’s hard to explain why. Some say they just need to do it and that it’s very pleasurable for them. However, experts say you shouldn’t overdo it because it can cause arthritis. Scientists have noticed that those who don’t do it usually take about 20 minutes before they can snap their fingers again.
Some people don’t have this habit and even say they like to watch others when they do it. Some admit that they tried it out of curiosity but didn’t hear the cracking sound. ČThey even felt something uncomfortable inside their fingers.
Take a look at this MRI image, which shows what happens when your fingers snap:
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