What is love? Is it that warm and fuzzy feeling, that crazed obsession, that deep sentiment of trust and good will? It’s all of those things, but where and how does love happen in our bodies?

On this special episode, we put love under the microscope (and into a brain scanner) to understand where this emotion begins, and where it takes us. We talk with neurologists and psychologists to get a better understanding of the feeling that can turn us into heroes, fools — or both.

Also heard on this week’s episode:

• Call it a crush, call it infatuation, call it obsession — some experts call it limerence. Reporter Grant Hill explains the difference between love and limerence, and what it has to do with “love addiction.”
• How much has online dating changed the way we pick our romantic partners? We talk with biological anthropologist Helen Fisher, who developed an in-depth questionnaire for the dating site Match.com.
• We also put together a mixtape with some of our favorite songs about love. You can find it on Spotify.