At 5:30 in the morning, Sandra McGirr, a Canadian nurse and co-­‐founder of DESEA Peru and Vilma Florez Huayllapuma, a Peruvian nurse who grew up in the Sacred Valley of the Incas, pulled up in an old pickup truck with a cracked windshield.  We would be spending the day driving to tiny communities high up in the Andes so that Sandra and Vilma could visit families, check on their health and monitor the water filtering systems that DESEA installed.  DESEA is a small NGO that focuses on the health of women and families in the Sacred Valley.  We stop in the small city of Calca, with its bustling market activity including dozens of types of potatoes for sale, to buy dozens of ...