I’m all for scientific advancement, but cloning human embryos? I don’t know enough about it to really form a solid opinion, but I’m leaning toward the we need a really, really good reason to go there. Not just because it might help someone some time in the future.
Cloning an embryo means taking DNA from a person and inserting it into an egg, which is then grown for about five days until it is an early embryo, a hollow ball of cells smaller than a grain of sand. Stem cells can then be recovered from the interior, and spurred to give rise to specialized cells or tissues that carry the DNA of the donor.
Not So Fast 