For ten days or so in 2015 the world was watching the images from Nepal, where 9,000 people had died. During the same ten days, diarrhea from contaminated drinking water also killed 9,000 children across the world. There were no camera teams around as these children fainted in the arms of their crying parents. No cool helicopters swooped in. Helicopters, anyway, don’t work against this child killer (one of the world’s