Professor Paul Zak proves that a single molecule accounts for why some people give freely of themselves and others are coldhearted, why some people cheat and steal and others can be trusted with another's life, why some husbands are more faithful than others, and why women tend to be more generous, not to mention nicer, than men. Oxytocin is that molecule. Zak recounts his extraordinary stories and sets out, for the first time, his revolutionary theory of moral behavior.
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