A hundred 50 turns out mathematically to be an ideal number. Information flow round networks by the side of that, and in quite a narrow band either sides of that, efficiency falls away very dramatically. There individual differences in this number. Is indeed due to personality differences. Extraverts have more people in their circle of friends,. Introverts tend to have fewer.
Robin Dunbar has been hailed as one of the most insightful and creative evolutionary thinkers of our time, famed for his work on human networks and communities (he came up with the Dunbar number, the idea that humans can have no more than 150 meaningful relationships). Now he turns his attention to religion, the subject of his recent book, How Religion Evolved: And Why It Endures. Joining Robin in conversation on the podcast is Stuart Ritchie, Psychologist at King's College London, and author of Science Fictions.
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