Learn about electronics, mechanics, and Muscle Wire with this fun activity kit. Each finger of the robot hand contains a Muscle Wire connected to an LED. The LED lights up when power runs through the finger. As the wire heats, the finger bends!
ThinkGeek :: Nanodots GYRO DUO: Magnetically Gyroscopic Balls - Display them, play with them, use them to move other magnets, build things (by combining sets), and have fun playing with these magnetic balls.