China has become the first nation to send human artificial embryos into orbit, aiming to uncover how space conditions like ...

China's Tianzhou-10 mission just delivered embryo-like structures made from living stem cells to the Tiangong space station.

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.

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 ...