Describes how to build marble runs using cardboard tubes and paper plates.
Marne Ventura writes educational material for children in grades K to 6. A former elementary school teacher, she holds a Master's Degree in Education with an emphasis in reading and language development from the University of California. Marne has helped to create more than 50 software products and apps for learning math, science, reading and social studies. She also contributes stories and articles to children's magazines. She is a puzzle, brainteaser, and word game enthusiast. Marne lives with her husband in Arroyo Grande, California.
