The science of romance: Brains have a love circuit

(AP) -- Like any young woman in love, Bianca Acevedo has exchanged valentine hearts with her fiance. But the New York neuroscientist knows better. The source of love is in the head, not the heart. She's one of the researchers in a relatively new field focused on explaining the biology of romantic love. And the unpoetic explanation is that love mostly can be understood through brain images, hormones and genetics.

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