Electricity and magnetism: Holiday light circuit -- Crane -- Electric car -- Electrostatics -- Magnetic spinner -- Solenoid and speaker -- Sound, light, and perception: Chirping bird and cuica -- Musica: Saxophone, harmonica, guitar, bull roarer, oboe, and sucker -- Xylophone and marimba -- Kaleidoscope -- Thaumatrope -- Mechanics: Balancing acts -- Catapult -- Dangling spinner -- Mini-bot -- Rubber band racer -- Voladores de Papantla ("birdmen of papantla") -- Fluids and aerodynamics: Airplanes -- Flying fish -- Helicopters -- Hydraulic butterfly -- Stomp rockets -- Toilet -- Tornado -- Biology: Eye model -- Fingers of the hand -- Heart pump -- Lung model -- Chemistry: Cartesian divers -- Oil on water -- Gak and oobleck -- Appendixes: Bringing these projects into the classroom -- About the Watsonville Environmental Science Workshop -- Index.