A closer look
Cracking your knuckles does not actually cause arthritis, despite what your concerned relatives told you, as that satisfying popping sound is merely the result of synovial fluid cavitation, where negative pressure suddenly forms a tiny gas bubble that collapses within the joint capsule; medical researcher Donald Unger famously proved this by aggressively cracking the knuckles on only his left hand every single day for sixty years while leaving his right hand alone, ultimately finding absolutely no difference in arthritis between the two, which is an awe-inspiring level of scientific pettiness just to prove a point, though the sound will still make your sensitive coworkers violently flinch
