内容简介：
Why is the sky blue? How do see-saws work? What's ooblech? This series provides fun experiments and explanations that answer all sorts of questions and tie into the K-4 science curriculum. The books will surprise your students with the realization that science is not just in the classroom -- it's in the kitchen, in their food, in the gym, in the playground, in the car -- it's even right in their own backyard Most kids love to play at the play-ground, but they probably don't know that almost everything there relies on the laws of science. This enlightening book uses experiments to illustrate the principles behind the swing, the see-saw, and the slide, among others.