US scientists and international universities have joined hands to help solve the arsenic problem in Bangladesh's drinking water. Many of the area's wells contain water with arsenic concentration of 500-1,000 parts per billion. Working with collaborators at the Massachusetts Institute of Technology, the University of Tokyo, and the Bangladesh University of Engineering and Technology, the researchers will explore: why arsenic concentrations are so high in the groundwater of Bangladesh and how they will change over time and space.