Loreen Leedy's nonfiction books-- including 2 X 2=Boo, Seeing Symmetry, and more-- are staples in classrooms across the country. Her books have been ALA Notable books, Kirkus Reviews Best Books, and Booklist Editors Choices. Ms. Leedy lives in Florida. Learn more on her website at www.loreenleedy.com.

Dr. Andrew Schuerger is a research professor in the Department of Plant Pathology, University of Florida. His office and lab are in the Space Life Sciences Lab at the Kennedy Space Center, where he studies Mars astrobiology and plant-pathogen interactions.