Fidgets and Noises: The Science Behind Common Manias

The video explores common habits like joint cracking, leg shaking, and leg crossing, examining their causes and effects. Joint cracking is caused by air bubbles in synovial fluid and is not linked to osteoarthritis. Leg shaking often results from stress and excess energy, while restless leg syndrome is a distinct medical condition. Crossing legs is a natural movement that doesn't harm circulation unless combined with tight clothing. Overall, these habits are generally harmless but can be annoying to others.

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