One of the most inspiring stories of global health success—one that I share whenever I get a chance—is India’s triumph over polio. Just a few years ago, India was home to the largest greatest number of polio cases in the world. It was expected to be the most difficult place to eliminate the crippling disease because of densely crowded urban areas, poor sanitation, large migrant populations, and the fact that over 27 million Indian babies are born every year. Now it’s been over two years since India has had a single case of polio. This story is proof that major health problems can be overcome in the most challenging places in the world. It’s also a powerful reminder of why the Bill & Melinda Gates Foundation invests in programmes to fight disease and poverty in India.