Phnom Penh, Cambodia:  USU Professor Sarah Null is part of  the project launch for the USAID Wonders of the Mekong project.  We started collecting samples from the head water (source) that gives birth to the Tonlé Sap lake / river and then eventually to the Mekong River. This is an ancient cultural place with wonderful stone carvings near and around Angkor Wat. It is impossible to study this system without understanding the Angkor culture. 750,000 people living and thriving and Angkor and then suddenly they are gone in a short time. Was it ecological – maybe climate related?