often don't last a lifetime, sometimes not even half of one. They come with no
guarantee, warranty or owner's manual. Disease, injury and aging can ravage bones,
organs, joints, ligaments, tendons and skin. Even a sports injury sometimes causes
damage that's beyond medicine's ability to repair. So when we are in dire need
of a spare part in this age of technological hype and hope, how do we begin to
decipher the biologically possible from the realm of science fiction?
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