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: ...

Research into how a father’s choices — such as diet, exercise, stress, nicotine use — may transfer traits to his children has ...

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.

It's a myth that sperm die upon contact with oxygen. In fact, their resilience might surprise you. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works ...