Who hasn't seen it before: the view through the microscope in which a sperm penetrates an egg cell and fertilizes it. This fundamental step in procreation happens dynamically and seemingly without ...

In a common metaphor used to describe human fertilization, sperm cells are competitors racing to penetrate a passive egg. But as critics have noted, the description is also a 'fairy tale,' rooted in ...

Researchers found that microgravity impairs sperm navigation without affecting speed, reducing fertilization rates and ...

Sperm may lose their ability to navigate in microgravity, raising new questions about whether human reproduction is possible in space.