Human testicles are much smaller, in proportion, to some of our primate cousins. Evolution can tell us why. But the size of ...

Researchers mapped Y chromosome loss across thousands of individual cells from human cancers, with disturbing results.

Scientists found microplastics in fluids around human eggs and sperm. Plastics from cookware and packaging affect human ...

Human sperm can swim through surprisingly viscous fluids with ... Scanning electron micrograph of a sperm cell in a fallopian ...

After only five minutes of exposure to the parasite, 22.4% of sperm cells were beheaded. The number of decapitated sperm increased the longer they interacted with the parasites.

If we look across the whole of the mammal branch of the tree of life, we find there are many groups of mammals that have ...

STAR, a new AI fertility tool developed by Dr. Zev Williams, has helped a couple who struggled to conceive for 18 years get pregnant.

The human body is a machine whose many parts – from the microscopic details of our cells to our limbs, eyes, liver and brain – have been assembled in fits and starts over the four billion ...

Male fertility rates have been plummeting over the past half-century. An analysis from 1992 noted a steady decrease in sperm counts and quality since the 1940s. A more recent study found that male ...