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Episode Details

Grey's Anatomy Season 4 Episode 7: "Physical Attraction, Chemical Reaction"

It's all about chemistry. You either have it or you don't. In trailer land, Derek is starting to wonder what he got into… with t...

Grey's Anatomy Season 4 Episode 7 Quotes

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.

Derek: What's new with you?
Meredith: I saw my half-sister half naked.

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