I dont doubt the switch from Hunter to farmer was traumatic. It gave birth to the Abel (hunter) and Cain (farmer) story. And it is not a nice portrayal of farmers. The chimps told us, that male dominance dont need farming to occur. The article pretend we are intelligent because we were a sex-equal species (less inbreeding) The probelm with the study reside in the way they mesured sex-equality: Why using the dispersion of family member? That sound like a second level indicator prone to be influenced by other factors (not only sex-equality, but wealth, heat, culture, whatever in fact) I'd rather have the hunter gathere society being ask question about gender role, and compare that to a poll in a male dominated society, or in Danemark, and see how their responses mesure up. But I like to believe we are intelligent because we're the only species with a natural sex-equalty.. and a white sclera