This milestone opens the door to sexless reproduction in mammals, something that was thought impossible to achieve, and paved the way for possible experiments on humans. Cover of A Happy World by ...

Male and female reproductive systems allow human reproduction. Fertilisation occurs when a sperm and egg join to form an embryo. An embryo develops into an unborn baby in the uterus during pregnancy.

“At that point,” says Pavličev, “the clitoris lost its function for reproduction.” Pavličev’s work raises other, even more fascinating questions. Why did humans start ovulating ...