Five seasons of excavations at Ban Non Wat, in Northeast Thailand, have unearthed 470 human burials covering a time span of more than 2,000 years. Earthwatch-supported research at this great moated site, led by anthropologist Dr. Charles Higham of University of Otago (New Zealand), gives clues to the roots of the famous Angkor civilization. A Year On Earth, a new film about students making a difference through participation in scientific research, features some of these discoveries.