Meredith (opening voiceover): Biology determines much of the way we live. From the moment we're born we know how to breathe and eat. As we grow older new instincts kick in. We become territorial. We learn to compete. We seek shelter. Most important of all, we reproduce. Sometimes biology can turn on us though. Yeah, biology sucks sometimes.
Cristina: Welcome home. It's ours. We bought it. Well, I bought it, but it's for the both of us.
Owen: I don't know what to say.
Cristina: Our house has a firepole in it. What else is there to say?
Owen: You said this morning...
Cristina: I don't care where we live, I really don't. But you do. You love this place and I love you.
Alex: Post-ops are stable and I've ordered morning labs.
Arizona: Hmm. Thanks.
Alex: You know, Sloan risked his life to save mine, even when I was sleeping with his girl. That's not a guy without a soul. Maybe he's an ass who stares at boobs, but whatever. And your boobs? You have nice boobs, and maybe they're lesbian boobs and you don't like men staring at them... But men don't discrimate when it comes to jugs. You have hot boobs, and I stare at them, too.
Teddy: I'd throw a party. Invite everyone to an amazing beach, all expenses paid. I mean, I'd have to make out my credit cards in order to pay for it, but what do I care? I wouldn't be around long enough to pay it off.
Meredith: I'd do what Leila did. I'd quit, sell the house, and bum around the globe.
Teddy: How'd Derek feel about that?
Meredith: Ah, he could come if he wanted.
April: Um, hey, how would you feel if I started a chore wheel at the house? The boys are so messy and I did one with Reed at our old apartment and you'd be surprised how well it works.
Lexie: Are you moving in, like permenatly?
April: Um, why? Do you think that that's not okay? Should I talk to Meredith about that?
Lexie: Oh, that's up to you. But I wouldn't bring up the chore wheel. Meredith would hate that.
Cristina (about their patient who ate worms for an experiment): You know he's crazy, right?
Bailey: Well, crazy is relative, Yang. In fact, some people might say that missing rounds this morning when I'm in charge, is crazy behavior, too. But, here I am, trusting you to take care of my patient. Maybe I'm crazy. What do you think? Am I crazy to trust you to take care of my patient?
Cristina: No. But I haven't been swallowing worms.
Meredith: I drank a lot of tequila in college. After.
Derek: Well, it's been a while since I've done my OB rotations but I don't recall tequila getting in the way of conception. It's the opposite, actually.
Meredith (closing voiceover): Biology says that we are who we are from birth. That are DNA is set in stone. Unchangeable. Our DNA doesn't account for all of us though, we're human. Life changes us. We develop new traits. Become less territorial. We start competing. We learn from our mistakes. We face our greatest fears. For better or worse, we find ways to become more than our biology. The risk of course is that we can change too much to the point where we don't recognize ourselves. Finding our way back can be difficult. There's no compass, no map. We just have to close our eyes, take a step, and hope to God we get there.