Scientists have boosted the motility of sluggish sperm by up to 266%, by blasting the cells with noninvasive, 40-MHz ultrasound waves to induce movement. Capturing the technique's impact on individual ...

In the United States, an estimated 645,000 men ages 20 to 50 have azoospermia, a condition in which no sperm are present in their ejaculate. Now, scientists are testing a potential treatment: ...

We all know the drill for reproduction—sperm meets egg. But mice aren’t people. And the same recipe doesn’t work for human reproductive cells. One reason, according to Dr. Mitinori Saitou at Kyoto ...

Jaiwen Hsu was an active 11-year-old when he developed pain in his left knee that forced him to sit out a few soccer games. What his parents thought was a sports injury turned out to be osteosarcoma, ...

Video of a new mathematical model that predicts that mammalian sperm cells have two distinct swimming modes. This prediction opens new questions about potential connections between sperm cells’ motor ...

A colony of human embryonic stem cells is seen on a computer monitor at the University of Wisconsin–MadisonDarren Hauck / Getty Researchers at Newcastle University in England report they have coaxed ...

It’s a complex process to identify a new star within a congested galaxy. It’s equally as trying to isolate cells viable for reproduction in someone struggling with infertility. A new artificial ...

Research into how a father’s choices — such as diet, exercise, stress, nicotine use — may transfer traits to his children has become impossible to ignore. The standard sperm-meets-egg story posits ...