Devious sperm 'poison' their rivals, forcing them to swim in circles until they die

The most successful sperm poison their competitors. A study in mice has found a genetic variant that gives sperm a 99 per cent success rate – and could explain infertility in human men.

OHSU lawsuit and documentary about sperm donors and the unrestricted practice of sperm banks. 15+ children of the same donor tell their story.

Some mouse sperm try to sabotage rivals in race to fertilise the egg