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Scientists don't want to use fetuses. They want to use embryos. There's a big difference between a microscopic bundle of cells and a partially-formed baby (except to religious fundamentalists). The reason science wants to use embryonic stem cells over adult stem cells is that embryonic stem cells are more flexible because they havent decided what to be yet. If you're harvesting from bone or fat or wherever, you're too late to get the cells that have the greatest potential. It's great that they are able to use the umbilical cord to help this woman and others, but humanity will not know just how much we can do until we go the source and exhaust all the possibilities of embryo cells.
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