Paul Zak, author of the new book The Moral Molecule, is a pioneer in the study of oxytocin, the neurotransmitter that brings feelings of trust and empathy. Having stimulated the release of oxytocin in experimental settings, he decided he’d try to stimulate its release in less formal settings. And that, as he explains here, is how he became known as “Dr. Love.”

You can watch the whole conversation at BhTV.