Our friend Stephen Dubner, co-author of the Freakonomics books and the Freakonomics blog at The New York Times, joins us all this week. We'll ask him what motivates the questions he asks in the new book, "SuperFreakonomics: Global Cooling, Patriotic Prostitutes, and Why Suicide Bombers Should Buy Life Insurance." Today's topic is health care costs and the impact of 'all-you-can-eat' insurance plans.

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