An important breakthrough meets a critical requirement for creating lab-grown sperm.
Why are Americans having less kids?
Stress can be hereditary, but new research suggests it doesn’t have to be.
Low sperm count is also associated with health problems, including high risk of cancer and heart disease.
A study has found that men with poor semen quality often have lower testosterone levels, increasing their susceptibility to common diseases as they grow older.
Due to an error, 26 women's eggs may have been fertilized by sperm from someone who isn't the "intended father."
Ole Vidar Toftesund has a cunning plan.