How Many Friends Does One Person Need? - Dunbar’s Number and Other Evolutionary Quirks

Key Facts or Insights from the Book

1. Introducing Dunbar's number, a cognitive limit to the number of individuals with whom any one person can maintain stable relationships, which is around 150.
2. The correlation between brain size, especially the neocortex, and social group size in primates, including humans.
3. Exploration of the evolutionary reasons for laughter and humor as social bonding mechanisms.
4. Discussion of the social brain hypothesis, which suggests that human intelligence evolved primarily as a means of surviving and reproducing in large and complex social groups.
5. Evidence that humans spend about 20% of their waking time in social interactions,...

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