In India, Grameen Community Agents go by the name of Grameen Mittra (Grameen means Village and Mittra means friend). And Harsha Tai loves being one because it feels good to help so many. Lihaba and her husband Shipmau are one example. Shipmau suffers from dementia that renders him unable to speak, as well as paralysis in his legs that has robbed him of his ability to walk. But their ability to live depends on his pension, a 12-kilometer test of determination and strength. Before Harsha Tai (Tai-means Elder Sister) came into their lives, every single week, to get to the bank, Lihaba would lift her husband off the ground and use a motion—lift, pull, drag, lift, pull, drag—for two kilometers, to get her husband to the bus stop. Then they would ride the bus another ten kilometers, where she again would lift, pull, and drag him to the bank. In...