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The Evolution of Language and Technology
There are correlations where social animals do on average have larger brains. Part of that is probably the additional social applications of brains, like keeping track of which of your group members have helped you before so that you can reciprocate. But what they don't have is the ability to sustain culture. And if you have a small population, and you have some limited number of people who know a skill, and they happen to die, or it happens, there's some change in circumstances that causes people not to practice or pass on that thing. Ben: If we were accumulating technologies faster than we were losing them, those technologies allowed us to expand our population. They became three times as large as their ancestors