President Jimmy Carter President Jimmy Carter

Former President George H.W. Bush flipped the coin for the kickoff between the Detroit Lions and Houston Texans at NRG Stadium in Houston on Oct. 30, 2016. Bob Levey/Getty Images hide caption

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Bob Levey/Getty Images

Former President Jimmy Carter delivers a lecture on the eradication of the Guinea worm at London's House of Lords on Feb. 3. The lecture title: "Final Days of the Fiery Serpent: Guinea Worm Eradication." Eddie Mullholland/WPA Pool/Getty Images hide caption

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Eddie Mullholland/WPA Pool/Getty Images

Jimmy Carter May Soon Get His 90th Birthday Wish: No More Guinea Worm

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President Obama, first lady Michelle Obama and former presidents Jimmy Carter and Bill Clinton at the March on Washington 50th anniversary celebration. Charles Dharapak/AP hide caption

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Charles Dharapak/AP