Vaccination is pretty special because you can do a vaccination campaign anywhere in the world. All you are doing is gathering women from the villages, getting them the vaccines and asking them to go around and find the children.
THERE IS NO mystery to happiness. Unhappy men are alike. Some wound they suffered long ago, some wish denied, some blow to pride, some kindling spark of love put out by scorn--or worse, indifference--cleaves to them, or they to it, and so they live each day within a shroud of yesterdays. The happy man does not look back. He doesn't look ahead. He lives in the present.