Why Do Joints Crack and Pop?

Why the fuck do your joints crack and pop like bubble wrap? Here's the deal.

Your joints are filled with synovial fluid, a slippery-ass liquid that keeps your

bones from grinding together like a garbage disposal. When you stretch or move your joint,

you create negative pressure that pulls dissolved gases—nitrogen, oxygen, and CO2—out of that

fluid real fucking fast. This forms a gas bubble cavity through a process called

tribonucleation. The second that cavity pops into existence, BOOM,

you hear that crack. It's not the bubble collapsing, it's the bubble forming that makes

the noise. Scientists used real-time MRI to prove this shit in 2015.