4/4 Michael Mosley reveals the ingenious ways the body defends itself against a hostile world.
3/4 Michael Mosley traces our development from birth to adulthood.
2/4 Michael Mosley shows how the body performs countless small miracles to stay alive.
1/4 Michael Mosley shows the sequence of biological events that lead to human birth.
Michael Mosley tells the extraordinary story of how a sperm and egg fuse to create life.