 An alternative way to integrate an explanatory component in a statistical normality account involves picking out that set of statistically common properties that have a purely evolutionary explanation (Machery 2008; 2018). This reinterpretation of the concept of naturalness that featured in the original package (TP1) involves a contrast with social learning. Processes grouped together under this latter description are taken to be alternative explanations to those provided by evolution. However, learning plays a central role, not only in the development of individual humans, but also in the iterated interaction of entire populations with environments structured and restructured through such interaction (Stotz 2010: 488ff.; Sterelny 2012: 23ff.). Hence, the proposal raises serious epistemic questions as to how the distinction is precisely to be drawn and operationalised. (For discussion, see Prinz 2012; Lewens 2012: 464ff.; Ramsey 2013: 985; Machery 2018: 15ff.; Sterelny 2018: 116; Kronfeldner 2018: 147ff.).