“In most times, places, and stages of development, people’s abilities in arithmetic consist of the exact quantities ‘one,’ ‘two,’ and ‘many,’ and an ability to estimate larger amounts approximately. Their intuitive physics corresponds to the medieval theory of impetus rather than to Newtonian mechanics (to say nothing of relativity or quantum theory). Their intuitive biology consists of creationism, not evolution, of essentialism, not population genetics, and of vitalism, not mechanistic physiology. Their intuitive psychology is mindbody dualism, not neurobiological reductionism. Their political philosophy is based on kin, clan, tribe, and vendetta, not on the theory of the social contract. Their economics is based on tit-for-tat back-scratching and barter, not on money, interest, rent, and profit. And their morality is a mixture of intuitions of purity, authority, loyalty, conformity, and reciprocity, not the generalized notions of fairness and justice that we identify with moral reasoning.” – Steven Pinker, “The cognitive niche: Coevolution of intelligence, sociality, and language”