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I never thought about the donating egg and sperm to grow stem cells whenever you need them. That is an interesting idea. Not all stem cells are embryonic, but the best quality ones are. There are some stem cells they can get from umbilical cords, foreskins (removed from babies), and baby teeth. The quality of those is lower though.
Stem cells really are amazing. They grew a rat lung independant of a body with stem cells. There ends the organ shortage. On a strange note, they also grew a rat penis with stem cells. I don't know the reasoning behind that, maybe that it is a more complex organ or something.
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