Researchers have digitized 106 years of growth data on the birth, growth and death of individual plants on Tumamoc Hill in Tucson, Ariz., making the information available for study by people all over the world. The permanent research plots on the University of Arizona's Tumamoc Hill represent the world's longest-running study that monitors individual plants. Knowing how plants respond to changing conditions over many decades provides new insights into how ecosystems behave.