In this book, the goal is to watch something happen with a simple toy and then become curious enough to find out why. Sometimes, further research is needed. Exercises are done in groups, and students' conclusions are drawn in groups. The teacher guides and encourages the groups and, at the end, verifies the conclusions.

Pressure and force -- Laws of thermodynamics -- Energy -- Visible light and colors -- Resonance -- Buoyancy -- Two-dimensional motion -- Angular momentum -- Magnetism -- Electromagnetic induction -- More fun.