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NEW YORK, NY - JANUARY 12: Former President Jimmy Carter attends "Countdown To Zero: Defeating Disease" preview press conference at American Museum of Natural History on January 12, 2015 in New York City. (Photo by Andrew Toth/Getty Images)

NEW YORK, NY - JANUARY 12:  Former President Jimmy Carter attends "Countdown To Zero: Defeating Disease" preview press conference at American Museum of Natural History on January 12, 2015 in New York City.  (Photo by Andrew Toth/Getty Images)