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A few million years ago evolution realized that, in critical moments, choosing in a fraction of a second whether to trust a stranger, following a principle that can be wrong 50% of the time, allows one to survive longer than choosing by following a slow but more precise analysis. Moreover, a few hundred thousand years ago, this reckless trust or distrust was practiced in groups of a few dozen individuals. An error of judgment could easily be corrected by the numerous occasions that everyday lif...