Former U.S. president Jimmy Carter speaks at the opening of a new exhibit, "Countdown to Zero, Defeating Disease" at the American Museum of Natural History in New York, in this January 12, 2015 file ... more 
Former U.S. president Jimmy Carter speaks at the opening of a new exhibit, "Countdown to Zero, Defeating Disease" at the American Museum of Natural History in New York, in this January 12, 2015 file photo. Carter underwent an elective surgery at Emory University Hospital and his prognosis is "excellent" for a full recovery, The Carter Center said in a statement on August 3, 2015. Carter, the 39th U.S. president, had an operation to remove a small mass in his liver, the center said. REUTERS/Mike Segar/Files less 
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Reuters | Photo By MIKE SEGAR / REUTERS
Mon, Aug 3, 2015 3:13 PM EDT