Physical Attraction, Chemical Reaction promo

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