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RENEE MONTAGNE, HOST:

We've regaled you with 007 moments this week, as we celebrate the 50th anniversary of James Bond films. Now we try to answer a question about Mr. Bond's taste in liquor. He had a particular way of ordering his martinis.

(SOUNDBITE OF MOVIE, "GOLDFINGER")

MAI LING: (Mei-Lei) Can I do something for you, Mr. Bond?

SEAN CONNERY: (as James Bond) Just a drink. A martini, shaken, not stirred.

(SOUNDBITE OF BOND MOVIE)

UNIDENTIFIED MAN: (as character) Say what, so vodka martini straight up?

TIMOTHY DALTON: (as James Bond) Shaken, not stirred.

MONTAGNE: So, are there any differences scientifically, between a shaken martini and one that is mixed by stirring? We sent NPR's Joe Palca and Allison Aubrey to Bar Dupont in D.C. to answer this question.

BRIAN COLLINS: And what will you be having today?

ALLISON AUBREY, BYLINE: Make that a dry martini, vodka - and shaken, not stirred.

COLLINS: Excellent.

AUBREY: And for the gentlemen?

JOE PALCA, BYLINE: Me too.

COLLINS: All right.

PALCA: When I found out we had this assignment, I thought can there really be a physical or chemical difference between a martinis that's shaken, not stirred.

AUBREY: I thought really probably there are ways to tell the difference in terms of how they look.

PALCA: Well, there are some physical reason is that you could actually say OK, this is different for a shaken martini and it is for a stirred martini.

AUBREY: So like actual chemistry differences?

PALCA: Chemistry and physics. And on the chemical front when chemicals in alcohol mixed with air, when you're shaking it up and you're getting sloppy, this air bubbles that are forming, if there's anything that's reactive, if there's anything that's still going to mix with oxygen, it will do it then. It's a little bit like wine grapes.

AUBREY: Wine. That's what I was going to say. Yeah.

PALCA: Exactly.

AUBREY: So it's a real physical effect.

PALCA: It's probably small, but it's probably something that a refined palate can taste.

COLLINS: Would you care for olives or twists?

AUBREY: Twist, please. Ah, good enough.

PALCA: So in the physics it would be that the heat transfer from the ice to the liquid is more efficient when you shake a martini. Because what you're doing is you're exchanging the cold that's in the ice cubes with the alcohol much more efficiently.

AUBREY: Ah, got it.

PALCA: So yes, it is more, a little bit of ice on the top sometimes, depending on whether the ice is flaking off or not.

AUBREY: Well, let's take this cooling effect one step further. I'd like to get into the realm of sensory science. So, you're talking about those little ice crystals making it colder, but as these tiny crystals melt, do you know what they're doing?

PALCA: What?

AUBREY: They're actually diluting the martini.

PALCA: Oh yeah, that makes sense. So why would you want a more dilute martini? I mean doesn't that defeat the purpose?

AUBREY: You know, that is a big question. My source thinks that maybe Ian Fleming thought about this and created Bond's preference for a shaken martini so that, you know, he could keep his head in the game. It looks like he was having the strong stiff drinks, when really the shaken might take the edge off a little bit.

COLLINS: I personally think so.

AUBREY: You think that's a good theory?

COLLINS: I think that's a good theory.

PALCA: Wow. (Unintelligible).

AUBREY: So my question is, you know, might we notice that difference? Might the burn a little bit less?

PALCA: Brian could make a stirred one and we could actually see if we could tell the difference.

AUBREY: What about if I blindfold you, you blindfold me, and then let Brian mix them up?

(LAUGHTER)

PALCA: I think - oh, we have napkins.

COLLINS: Let me save the glass ware here. All right. Here we go.

AUBREY: OK. We each get one here, one is shaken, one is stirred.

COLLINS: That's right.

AUBREY: All right. Cheers, Dr. Palca.

PALCA: Oh, yes.

(SOUNDBITE OF GLASSES CLINKING)

AUBREY: I've done the first one.

PALCA: I've got this.

AUBREY: All right.

PALCA: I'm already done. Can you tell the difference in this full slog?

AUBREY: In this sensory science.

PALCA: This sensory suggestion...

(LAUGHTER)

AUBREY: Let's try it. OK. I'm going to venture to say that the first one I tasted was shaken on the basis of temperature alone.

COLLINS: You are correct.

AUBREY: Oh, yes.

(LAUGHTER)

PALCA: I was going to say the same thing.

COLLINS: You are correct.

(LAUGHTER)

AUBREY: Awesome.

COLLINS: You two are good at this blindfold drinking martinis.

PALCA: OK. Spin them around again. Let's do this once again.

(LAUGHTER)

PALCA: Let's prove it wasn't a fluke. Best five out of 10, six out of four.

AUBREY: All right. Go for it, Palca.

MONTAGNE: NPR's drinking buddies, Joe Palca and Allison Aubrey.

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