Kluckhohn, C. Groups of people develop distinct patterns of thoughts, emotions, and behaviours as they respond to the survival challenges of their shared environment.
Although conditional strategies are found to one degree or another in most species, there are reasons to believe they are particularly important in Homo sapiens. However, not all collectives can or do develop such institutions, for a variety of reasons.
Within at most 50 years later, populations had established themselves on every continent around the globe, in habitats ranging from tropical forest and savannah to temperate and subarctic woodlands to desert and arctic tundra.
Watson's remarks to The Sunday Times [ 1617 ]. Why are some people left-handed? London: John Murray.