One of my favourite scientific advances in the last 20 years is the ability to take pictures of the brain and its circuitry in action and what this continues to teach us about how we are wired and therefore why we do what we do.

Anthropologist Helen Fisher is a leader in this area and has extensively studied what happens in the brain as it relates to love.  She has differentiated 3 types of love, that each have their own areas of the brain that light up.