And Now For Some Good News
Current theory as to why newts and their kin can regrow limbs while mammals can not is that as animals evolved into more complex morphologies the regenerative ability had to be sacrificed. Organisms that tried to be complex and have excellent repair mechanisms were at a higher danger of cancers and deformations and such. Luckily for us the regenerative system was not removed completely but just regulated. It now seems that it can be put back into high gear with newt proteins which could promise at least to provide sources of embryonic stem cells from a patients own tissue (sans embryo) which will keep the supernaturalists happy.