"What set us apart from most or all of the other hominid species was our ultrasociality, our ability to be highly cooperative, even with strangers, people who are not at all related to us."

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Parents who are cowed by temper tantrums and screaming defiance are only inviting more of the same. Young children become more cooperative with parents who confidently assert the reasons for their demands and enforce reasonable rules. Even if there are a few rough spots, relationships between parents and young children run more smoothly when the parent, rather than the child, is in control.

— Sandra Scarr