Barry's Roll, Slide, Glide! (A Bugville Jr. Story)

Barry and Buster want their toy wagon to travel farther, but pushing harder does not produce the result they expect. Instead of calling the attempt a failure, Barry suggests changing one feature at a time. The friends compare slopes, surfaces, and pushes while making predictions and noticing what happens. Their energetic investigation shows young readers that every result provides useful information—and that changing a plan is part of solving a problem.