Contents -- Introduction -- Thoughts on Safety -- 1 Magnetism -- A Few Simple Magnet Experiments -- Magnetorheological Fluids -- A Magnetic Heat Engine -- More About Magnets -- Measures Used in Permanent Magnets -- A Levitating Magnet -- Levitating Pyrolytic Graphite -- The Gauss Rifle -- 2 Electromagnetism -- A Quickie Electric Motor -- A Bigger Motor -- A Faster Motor -- A Motor with Two Coils -- A High-Voltage Motor -- A Rotary High-Voltage Motor -- A Simple Homemade Van de Graaff Generator -- A High-Voltage Ion Motor -- 3 Electrochemistry -- The Plastic Hydrogen Bomb -- A Solar Cell You Can Make in Your Kitchen -- A Flat-Panel Solar Cell -- 4 Radios -- Building a Simple Crystal Radio -- Building a Radio out of Household Implements -- A Very Simple Radio with Two Parts -- A Simple Radio with Two Parts -- Adding a Capacitor (or Three) -- A Simple Radio with Three Parts -- Building Your Own Capacitors -- Building Your Own Diodes -- Going Further -- Building a Radio in 10 Minutes -- Building a Very Simple AM Voice Transmitter -- Building a Three-Penny Radio -- Some Fun Packaging -- 5 Thermodynamics -- Hero's Steam Engine -- The World's Simplest Steam-Powered Boat -- A Rotary Steam Engine -- The Film Can Cannon -- The Mark II Film Can Cannon -- A Bimetal Strip Heat Engine -- A Metal That Melts in Hot Water -- Make Your Own Fusible Alloy -- 6 Light and Optics -- A Simple Laser Communicator -- Make Your Own 3D Pictures in Minutes -- Make a Permanent Rainbow -- A Solar-Powered Marshmallow Roaster -- Fun with a Big Lens -- A Solar Hot Dog Cooker -- A Simple Spectroscope -- The Polariscope -- Index.