"Sex differences in various psychological traits – in particular, average differences in career-related interests – contribute more to STEM gender gaps than is often assumed. These differences are not due solely to learning, but have a biological component as well... Certainly, the evidence for a biological contribution is not beyond criticism. We suggest, however, that the totality of the evidence renders the Nurture-Only view considerably less plausible than the Nature-Plus-Nurture alternative. The evidence we find most compelling includes the stubbornness of the sex differences over time, even despite efforts to eradicate them; the cross-cultural consistency of the differences; the early appearance of some differences during development; evidence linking the traits in question to prenatal hormonal exposure; and in some cases, comparable differences in evolutionarily relevant nonhuman animals. Each of these findings would be more surprising if the relevant sex differences were due solely to culture than if biology were also involved. And although alternative explanations for any particular finding are always possible, the convergence of these very different lines of evidence adds up to a strong prima facie case for a non-trivial biological contribution."