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

Knowing up and down seems key for sperm to reach an egg.

The central premise of the blockbuster film “Project Hail Mary” is a long-shot mission with a familiar goal: Save humanity ...

A new study found that microgravity simulated on Earth hindered sperm cell movement, egg fertilization and embryo development ...