Human sperm can swim through surprisingly viscous fluids with ease – and they seemingly defy Newton's third law of motion to do so. To figure out how they slither through substances that should, in ...

Human sperm have long been a subject of fascination—not just for their role in fertilization, but for their remarkable ability to navigate through some of the most viscous environments in the body.

Add Yahoo as a preferred source to see more of our stories on Google. We often imagine sperm as swimmers, tiny cells whipping their tails to power through fluid on a mission toward the egg. However, a ...

Like all stem cells, the fruit fly's sperm-making stem cells can renew themselves or can develop into more specialized cells -- eventually sperm in this case. While a few types of fairly specialized ...

Researchers at the MRC Laboratory of Medical Sciences (LMS) and Imperial College London have shown for the first time that, before they can start developing into egg and sperm cells, the embryonic ...

Katsuhiko Hayashi, a developmental geneticist at Osaka University, is working on ways to make what he calls "artificial" eggs and sperm from any cell in the human body. (Kosuke Okahara for NPR) ...

On-site doctors processed the sperm, which was then placed onto a microscopic racetrack while audiences followed along on the big screen. (Curtis Luong / Daily Trojan) In the last sperm race of Friday ...