This paper examines a dilemma in reproductive and population ethics that can illuminate broader questions axiology normative ethics. emerges because most people have conflicting intuitions concerning whether the interests of non-existent beings outweigh existing when those merely potential are expected to overall net-good or net-bad lives. The claims standard approach this issue, terms exemplif...

Ernst Mayr’s typological/population distinction is a conceptual thread that runs throughout much of his work in systematics, evolutionary biology, and the history and philosophy of biology. Mayr himself claims that typological thinking originated in the philosophy of Plato and that population thinking was first introduced by Charles Darwin and field naturalists. A more proximate origin of the t...

We report an optical photometric survey of 0.89 deg of the Orion OB1b association centered on Ori. This region includes most of the Ori cluster, the highest-density region within Orion OB1b. We have developed a statistical procedure to identify the young, low-mass, pre–main-sequence population of the association. We estimate that the cluster has 160 members in the mass range (0:2 M 1:0 M ). The...