The is a unique educational kit that can help illustrate to children how effective even small amounts of energy can be. The engine apears to run from air alone, however it is the temperature difference caused by your body heat that powers this little device.
The is like a cross between a hot air balloon and a kite. The 8 m long black plastic tube fills with air which heats up, sending it into the air. A 50 M line is attached to tether the airship like a kite.
The is a device that spins when it is placed in light. This device, invented back in 1873, still entertains adults and children today, as the vanes within the light bulb shaped dome spin. The spinning of the vanes gives the devices its other name, the light mill.
