Love isn’t just fodder for poets. For as long as people have been falling for each other, scientists have worked hard to locate the roots of love somewhere in the body. The ancient Greeks and medieval men of medicine believed that imbalances in bodily fluids like phlegm and blood were responsible for that weak-kneed, goofy-smiled condition of longing, but as early as the 1660s researchers had begun to grasp at the brain’s role in romantic love. Modern-day scientists know a lot more about how the emotion works — it involves the brain’s reward centers and pleasure chemicals like dopamine — but it’s still up for debate whether science or poetry describes it better.
More Photography from Time
- FLOTUS at 50: Michelle Obama’s Workouts
- Before Angelina: Portraits of Breast Cancer Previvors and Survivors
- Hungry Planet: What The World Eats
- When Celebrities Battle Cancer: Photos of 20 Inspiring Survivors
- The Artistry of Sleep: Photos of Icons Getting Some Shut-Eye
- The Disease that Won’t Die: Tuberculosis in Peru