Cafe Thorium, Ken Buesseler's Radiochemistry Group at the Woods Hole Oceanographic Institution, analyzes "marine samples for both natural and artificial radionuclides." Researchers can find out about the group's success using Neutrally Buoyant Sediment Traps (NBST) to collect particles in the ocean. Visitors can learn about the potential link between iron and glaciation. Students can obtain a handy radiation decay calculator as well as a colorful illustration explaining Thorium-234 presence in the ocean. The website offers many downloadable published articles related to the group's work.