In the 1980's, there were millions of cases of Guinea worm disease across the globe, mostly in rural Africa. Donald Hopkins, MPH '70, has spent 40 years working to eradicate this painful and debilitating disease – and he's had remarkable success. Last year, there were only 27 cases worldwide. In the latest episode of Better Off, Donald Hopkins talks about eradicating a disease that many people thought wasn't worth fighting.