A short ABC promo for "Physical Attraction, Chemical Reaction," the seventh episode of Season Four of Grey's Anatomy. Looks like a lot to keep track of in this one!
Meredith: [narrating] 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.