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Make toys at home with common household materials, often in only a few minutes, that demonstrate fascinating scientific principles.

• Magetism (eg. Magnetic Ring Launcher)
• Electromagnetism (eg. A 10 minute railgun)
• Electrochemistry (eg. Building your own solar battery.)
• Radio (eg. A radio out of household items)
• Thermodynamics (eg. World's simplest steam boat)
• Aerodynamics (eg. A Bernoulli levitation ball)
• Light and optics (eg. Make a spectroscope from a CD.)
• Biology (eg. Listening to Electric Fish)
• Mathematics (eg. Kaleidocycles)

Thanks to Boing Boing for the link