A sneak preview of Grey's Anatomy episode 4.07, "Physical Attraction, Chemical Reaction." Cristina lectures Lexie about not talking about her personal life, when a baby and her mother both arrive in need of urgent care.
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.