This individually-hosted Web site invites users to "make toys at home with common household materials, often in only a few minutes, that demonstrate fascinating scientific principles." Instructions for dozens of toys are available, and what's more, these instructions are accompanied by clear and accessible explanations of the scientific concepts associated with each project. The Web site is organized into eight chapters: Magnetism, Electromagnetism, Electrochemistry, Radio, Thermodynamics, Aerodynamics, Light and Optics, and Biology. Each chapter provides recommended reading titles for further learning.