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Growing organs from stem cells. Surgeon Paolo Macchiarini, Professor of Regenerative Surgery at Karolinska Institutet is famous for being the first man to grow (and transplant) a fully working human organ using adult stem cells. That was back in 2008 and since then five similar operations have been carried out.
Creatures that regenerate limbs and organs have stem cells that keep this ability throughout their life cycles. If a salamander's leg is cut off, for example, its stem cells rush into action and form a fast-growing mass of undifferentiated cells called a regeneration blastema, which eventually will differentiate and form the various structures of a new limb.