Scientists Reveal the Fluid Physics Behind Why Sighs Feel So Damn Good

The human body works in complex ways—sometimes, certain motions are so small that it’s easy to miss how they might cause discomfort in the body. In this way, the surface tissues in our lungs actually “resist” the expansion and contraction of the lungs when we inhale or exhale.

Normally, fluids inside the lungs help reduce this tension, but a new study suggests that the fluids themselves may also be subjected to similar motions that could get in the way of smooth breathing. That said,…