Fast-growing Phoenix is sometimes thought of as a “new” or “up and coming” place without much history. But as we learn in this episode, it was actually born from the ashes of a thriving culture with centuries of accumulated knowledge about how to thrive and grow food in a dry desert. In this third part of our water series, we look to the past for solutions to our current-day water problems. We explore the engineering prowess of Phoenix’s original inhabitants and travel to Ajo, Arizona where some of their descendants are working to revitalize traditional growing methods and water-efficient foods.