Research ethics committees must sometimes deliberate about objects that do not fit nicely into any existing category. This is currently the case with the “gastruloid,” which is a self-assembling blob of cells that resembles a human embryo. The resemblance makes it tempting to group it with other members of that kind, and thus to ask whether gastruloids really are embryos. But fitting an ambiguous object into an existing category with well-worn pathways in research ethics, like the embryo, is only a (...) temporary fix. The bigger problem is that we no longer know what an embryo is. We haven’t had a non-absurd definition of ‘embryo’ for several decades and without a well-defined comparison class, asking whether gastruloids belong to the morally relevant class of things we call embryos is to ask a question without an answer. What’s the alternative? A better approach needs to avoid what I’ll refer to as “the potentiality trap” and, instead, rely on the emergence of morally salient facts about gastruloids and other synthetic embryos. (shrink)

This study has a twofold objective: firstly, it aims to examine the main types of argument that have been formulated against human cloning, to identify their presuppositions and to evaluate their strength; secondly, it aims to argue that the most important objections against human cloning are philosophical and religious, in particular the objection that human cloning represents a radical form of disenchantment or an abuse of rationality. The birth of a cloned mammal, a sheep named Dolly, which was announced on (...) 23 February 23 1997, began a wide public debate on the morality of human cloning. I shall try to show that this debate should not be limited only to ethical and legal considerations, since it has more profound ramifications. The science of cloning is rooted in a certain metaphysical background, which, discreetly, but firmly, accompanies its spectacular promises, and which has profound consequences on our metaphysical and religious beliefs. This background needs to be openly discussed and evaluated. Moreover, it warrants the special attention of philosophers and religious thinkers alike. . (shrink)