The human body is constantly regenerating itself, but as we get older, the ability for self-repair diminishes. The human foetus, however, has far greater powers of regeneration. The programme explores how modern medicine is looking at ways to tap into the superhuman power of the embryo to discover the genes that promote this process so they can be reactivated to create new cells and organs. Even delicate tissue such as spinal cords and brain cells can be regrown with the use of neural stem cells.