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Title: What happens when you click your fingers?
Description: Pop goes the knuckle. The researchers observed the same phenomenon occurring in every one of Fryer's fingers: when a joint separated and made the “cracking” sound, a gas-filled cavity formed within the synovial fluid, a slick substance that lubricates the joints.

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Title: What happens when you click your fingers?
Description: Pop goes the knuckle. The researchers observed the same phenomenon occurring in every one of Fryer's fingers: when a joint separated and made the “cracking” sound, a gas-filled cavity formed within the synovial fluid, a slick substance that lubricates the joints.