Tyler Christopher, above left, and Zacharias Hale, both third-graders at Roosevelt Elementary School

Tyler Christopher, above left, and Zacharias Hale, both third-graders at Roosevelt Elementary School in McDonald, work with a lever during a COSI on Wheels visit to the school. Other pupils trying out stations Friday were, Chris Walters, far left, and Austin Colburn, who worked with wooden sticks and Velcro; Savannah Harrison, who tried to balance a plastic plate on top of a bowling pin; and Kayla Victor, who enjoyed working with various shapes. The pupils are in Thelma Snyder's class. The Center of Science and Industry is based in Columbus.