How religion made us a successful species
Victor Kumar and Richmond Cambell write: For most of history, human populations were limited to small bands of around 150 members. After exceeding that size, a band would split and drift apart, the descendants forgetting their common ancestry. At some point in human history, however, bands were knit together into tribes—groups of groups—geographically distributed but linked by ethnicity, dialect, and common purpose. Tribes had an edge over bands because they enabled cooperation at a larger scale. One vital benefit was…