Scientists have detected microplastics — the tiny and pervasive fragments now found in our seas, drinking water, food and, increasingly, living tissue — in human semen and follicular fluid, according ...

Katsuhiko Hayashi pulls a clear plastic dish from an incubator and slides it under a microscope. "You really want to see the actual cells, right?" Hayashi asks as he motions toward the microscope.

Researchers have uncovered the secret of human sperm propulsion through dense fluids, revealing an unconventional motion that appears to defy Newton's third law. In their study, the team analyzed both ...