guinea worm

The former president is now fighting cancer. For the past 30 years, he has fought to wipe out diseases that plague millions of people. The efforts have brought one parasite to the edge of eradication.

We've eradicated smallpox. But we can only hope to control malaria. A new exhibit at the American Museum of Natural History explains how disease fighters set and pursue their goals.

Those words were written on a poster that greeted the former president on a visit to Nigeria. His Carter Center has vowed to wipe out the nasty worm. And right now we're down to 126 cases.