Kathy B. Sheehan is a Research Associate in the Department of Microbiology and the Thermal Biology Institute at Montana State University, where she is supported by a National Science Foundation Microbial Observatory grant to study organisms in Nymph Creek, Yellowstone National Park. She also is funded by the National Park Service to survey thermal sites in Yellowstone for the presence of pathogenic amoebae. She has extensive field experience and has led many educational field trips in the park. David J. Patterson is Professor of Biology at the University of Sydney, NSW, Australia, and Adju...