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"The incursions of barbaric pastoralists seem to do civilizations less harm in the long run than one might expect. Indeed, two dark ages and renaissances in Europe suggest a recurring pattern in which …"

"Conceptual simplicity, recursiveness, and formal separation of levels of selection are attractive features of these equations. But, of course, being able to point to a relevant and generally non-zero …"

"If humans turn out to be near the Kondrashov limit —that is, if on average every gamete has one bad mutation created during the lifetime of its producer— it is obviously not going to be nearly enough …"