 This general evolutionary outlook gives reason to think that as human groups increased in size, they also grew in their capacity to carry more culture and produce more cultural innovations (Kline &amp; Boyd 2010; J. Henrich 2015: chapter 12), though the causal relationship between population size and cultural complexity remains controversial (Fogarty &amp; Creanza 2017, cf. Vaesen et al. 2016). As cultural innovations continued to accumulate, they allowed humans to more significantly control and reshape the environments in which they lived. Such transformations also reshaped the environments inhabited by subsequent generations, thus shifting the contours of the physical, social, and informational niches in which they evolved. Such changes, in turn, created a range of new selection pressures, many of which favored bodies, brains, and minds better equipped for sociality and cultural inheritance. Researchers continue to develop and debate the merits of different conceptual tools with which to conceive of this kind of evolutionary dynamic (Tomasello 1999; Laland, Odling-Smee, &amp; Feldman 2001; Laland, Odling-Smee, &amp; Myles 2010; Sterelny 2003, 2012; Richerson &amp; Boyd 2005; Tennie, Call, &amp; Tomasello 2009; Boyd, Richerson, &amp; Henrich 2011, J. Henrich 2015; Boyd 2017).