Nonlocal “realistic” Leggett models can be considered refuted by the before-before experiment. “Single preferred frame” models are not refuted by this experiment but bear severe oddities.

Results of recent research on hydatidiform moles and teratomas show that during pregnancy the embryo does not receive any message or information from the mother able to control the mechanisms of development or to produce the type of cellular differentiation necessary for building the tissues of the new human adult. Thus, the biological identity of the new human being does not depend on the sojourn in the uterus; the preimplantation embryo is the same individual of the human species as the (...) adult, into whom the embryo can in principle develop. (shrink)

We discuss models that attempt to provide an explanation for the violation of Bell inequalities at a distance in terms of hidden influences. These models reproduce the quantum correlations in most situations, but are restricted to produce local correlations in some configurations. The argument presented in (Bancal et al. Nat Phys 8:867, 2012) applies to all of these models, which can thus be proved to allow for faster-than-light communication. In other words, the signalling character of these models cannot remain hidden.

It is shown that the before-before (or Suarez-Scarani) experiment refutes hidden variable models with a deterministic (“realistic”) nonlocal part, whereas experiments violating Leggett-type inequalities refute models with biased random local part. Therefore the claim that Gröblacher et al. (Nature 446:871–875, 2007) present “an experimental test of nonlocal realism” is misleading, and Marek Żukowski’s (Found. Phys. 38:1070, 2008) comment misses the point. A new experiment is suggested.

Ethical concerns are motivating the search for alternative methods to obtain pluripotent stem cells without destroying human embryos. The supporters of these methods stress the importance of ensuring that the biological entities used in these alternative methods are not “disabled or sick human embryos.” In this article the authors argue that biological entities bearing anomalies or alterations that directly inhibit the appearance of neural activity (DIANA anomalies) share the moral status of human organisms fulfilling the clinical criteria for brain death. (...) By contrast, in the absence of DIANA anomalies, the moral status of a person cannot be denied. National Catholic Bioethics Quarterly 7.2 (Spring 2007): 315–335. (shrink)