First, I'm highly dubious that a reconstructed Neanderthal embryo is really that viable: look at the success rates of assisted reproduction when the parents are alive and in the room, let alone dead for tens of millenia!<p>Second, what ethics board would approve this experiment? There are risks to the surrogate mother, and, even if the child did come to term, what are the chances that it would be physically healthy? What about its psychological health?<p>As with mammoths, I can see the appeal, but this is about human beings.