Scientific disagreements constitute valuable resources for reflecting on epistemic peer disagreements. In this essay I engage in the debate whether epistemic peers who disagree should be conciliatory or steadfast by examining how scientists actually react in the so called nature-nurture debate. The main conclusion of the analysis is that, when taking into consideration concrete epistemic practices with peers responding to different epistemic perspectives, scientists have good reasons to be steadfast. At the same time, the theoretical conceptualizations of the epistemology of (...) peer disagreement illuminates certain aspects of the nature-nurture debate, such as its long persistence. Therefore, this article contributes both to the debate over the epistemology of disagreement and to the understanding of a never-ending controversy in the life sciences. (shrink)