Since Rebecca Moore started Google Earth Outreach in 2005, the computer scientist has used her company’s satellite-mapping technology to mobilize the public against mountaintop-removal mining in Appalachia and genocide in Darfur. But her most rewarding philanthropic project began in June 2007, when the chief of a small Amazonian tribe walked into her office in Mountain View, California. In her own words, Moore describes the unlikely collaboration that followed and explains how it is paying major dividends for the Surui people of Brazil.