Infertile couples desperate to conceive children are turning increasingly to fertility specialists for help. Yet, widespread use of assisted reproductive technology (ART) has led to a completely unforeseen consequence: the creation of the world’s largest population of frozen human embryos. That reality has ignited a vigorous moral debate among scientists, politicians, theologians, and parents about what should be done with the surplus store of nascent human life.The challenge for pro-life evangelicals is to develop systematic moral reasoning that can be applied to a range of issues including embryo adoption, human embryonic stem cell research, ART, “therapeutic cloning,” genetic engineering,...