Step-by-step, highly visual instructions lead a child successfully through each invention. Incredible illustrations present central scientific concepts, allowing children to discover the "why" as well as the "how." The use of everyday materials demystifies the way common electronic components work.
►SAFETY WARNING: CHOKING HAZARD - Contains small parts and marble. Not for children under 3 yrs. Children under 8 yrs can choke or suffocate on uninflated or broken balloons. Adult supervision required. Keep uninflated balloons from children. Discard broken balloons at once.
