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 […]
Sperm Use Secret Corkscrew Power to Turbocharge Their Swim
When we learn about “the birds and the bees,” we’re taught that after heterosexual intercourse, sperm swim up through the vagina, past the uterus, and into the fallopian tube, where one fertilizes an egg released by the ovaries. It turns out, however, that sperm aren’t just leisurely swimming—they’re racing through the female reproductive tract, propelled […]