Just in time for Valentine’s Day, Please Explain is all about the science of love.

Rutgers anthropologist Dr. Helen Fisher is author of Anatomy of Love: A Natural History of Mating, Marriage, and Why We Stray and Why We Love: The Nature and Chemistry of Romantic Love. University of Illinois at Chicago biologist Dr. C. Sue Carter is co-director of UIC's Brain Body Center.

Weigh in: Do you believe that love at first sight is an actual physical occurrence? Have you experienced it?