Image of The Day: Open-and-Shut Case
Image of The Day: Open-and-Shut Case
A special hinge joint allows some turtle species to close and open their shells.
Image of The Day: Open-and-Shut Case
Image of The Day: Open-and-Shut Case

A special hinge joint allows some turtle species to close and open their shells.

A special hinge joint allows some turtle species to close and open their shells.

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Collapsing Bubbles May Make Knuckle Cracks Noisy
Collapsing Bubbles May Make Knuckle Cracks Noisy
Ashley Yeager | Mar 29, 2018
A new mathematical model suggests the “popping” sound comes from partial bursts of gas sacs in joint fluid.