A ghost submarine....a hole in the palm of your hand...a barrel rolling uphill. Kids love optical illusions and special effects, and with the action-packed activities in this kit, they'll now be able to understand the science behind them! From balance to gravity, air pressure to magnetic attraction, key concepts are explored as kids complete the 30 engaging experiments in this one kit. Each experiment is fully illustrated in a step-by-step format, and then the science behind the effect is explained completely in kid-friendly language. Includes all components necessary (except a few household items).