Grey's Anatomy Quotes: Physical Attraction... Chemical Reaction

Meredith (voiceover): Before we were doctors, we were med students, which meant we spend a lot of time of studying chemistry. Organic chemistry, biochemistry, we learned it all. But when you're talking about human chemistry only one thing matters: either you've got it or you don't.
Meredith (voiceover): Chemistry, either you´ve got it or you don´t.