Our brains became hard wired for community in co operation. Those ancestors who, when they wander across the savanna, don't really care about the rest of the group or can't work well with them are going to get either tossed out or left behind to die. And so as a result, this becomes one of our most important needs. It was the beginning of the return, of our return as a species to the top of the food chain. Whereas previously we were skulking around the edges and running from everybody, now everybody has to run from us because we're so effective at working together. But that required more brain mass. And so that's when we see our cognitive abilities start

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