Loving with all your ... brain

... Ah, love...the flowers, the chocolate, the late night talks, the elevated dopamine levels in the caudate. What? Scientists are learning all the time about how romantic love is less emotion and more a powerful drive that comes from deep within our brain. Today, on Valentine's Day, find out the biological "why" behind what you feel, and watch Paula Zahn Now tonight at 8 ET to find out why love gone wrong can actually make you sick.

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