The book shows how kids learn about engineering science, and how their play and solutions equip them to understand grown-ups' actions later. Kids on teeter-totters learn about high-rise counter-balanced construction cranes, kids pushing other kids on wagons understand discussions of rockets launching heavy payloads into space, kids making snow-balls or making mud-clods (wet or dry, to throw at their buddies) learn about cohesion, plus about ballistics , kids watching meteor showers, phases of the moon, and eclipses understand later explanations of astronomy, kids experience scrapes and bruises, and then understand infections and topical medications, kids experience sticky and slick surfaces, then understand traction, and wet-road hydro-planing, and adhesive residue, kids quickly learn about the need for insulation (lots of it in winter, none in Texas summers), and therefore understand selection of clothing, insulation of houses . insulation of Arctic pipelines, and much more. Active kids learn a lot!