Beautifully crafted crystal radios - little works of art | http://solomonsmusic.net/Radios.html

http://solomonsmusic.net/Radios.html

Science Toys You Can Make With Your Kids | http://sci-toys.com/index.html

http://sci-toys.com/index.html

Magnetism:
Electromagnetism:
An electric motor in 10 minutes
Fun with High Voltage
A 10 minute railgun
A 30 second motor
Listening to magnetism
Electrochemistry:
A plastic hydrogen bomb
Building your own solar battery
Building a Hydrogen Fuel Cell
Homemade Batteries
Collecting Chemical Elements
Radio:
A quick and simple radio
Building a radio in 10 minutes
Build a portable crystal radio
A radio out of household items
A simple AM transmitter
The Three-Penny Radio
Thermodynamics:
Aerodynamics:
A Bernoulli levitation ball
A Homemade Vacuum Pump
A Classic Propellor Toy
Light and optics:
Simple laser communicator
Make a solar hotdog cooker
A solar powered marshmallow roaster
Biology:
Extracting DNA in your kitchen
Mathematics:
Kaleidocycles
A Geodesic Dome
A Homemade Microgram Balance
Computers and Electronics:
A Computer Controlled Transmitter
A Free Space Laser Data Transmitter
Fun With Solderless Breadboards
A Simple 1 Watt Amplifier