Why are some of us caring and some of us cruel, some generous and some greedy? The new science of morality— and how it could be used to create a more virtuous society. Part of the answer may reside in a hormone called oxytocin. Claremont Graduate University's Paul Zak talks with WSJ's Gary Rosen about how a "vampire wedding" helped him understand how this chemical works to control trust, empathy and virtue.

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