Kevin Loria January 13, 2015Humanity is close to eradicating a human disease from the face of the earth for the second time in history. (The first eradicated human disease was smallpox, which last infected someone in 1977.) That's pretty incredible — but it's a project that has required close to three decades of work, and it isn't finished. On Monday, former US President Jimmy Carter announced at the opening of "Countdown to Zero: Defeating Disease," a new exhibit at the American Museum of Natural History, that there were just 126 cases of Guinea worm disease left in the world. In...