“…When, precisely, do genetics enter into explanations of individual outcomes? This is not the place for a full philosophy of social science explanation, but one might imagine explanations abstractly as looking something like a network, with nodes being the nouns of explanation (events, states, "variables") and directed edges being the verbs (how cause-effect relations between nodes are produced, "processes," "whys"; see Bearman and Stovel [2000] on narrative networks, Hall [2004] on causal production, and Machamer, Darden, and Craver [2000] on mechanisms). The outcome is the terminal node of this network, with entering directed edges from its immediate causes.…”