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The best medical outcome is that the patient doesn\\u2019t get sick in the first place, notes New York City\'s health commissioner, and yet, \\u201cWe spend four trillion dollars on health care, and we spend about three cents of every dollar on prevention and public health. Something has to give.\\u201d He\\u2019s right, but what? Challenging! Presented with Columbia\\u2019s Mailman School of Public Health.\\xa0\\xa0Music: John Sherman.