Can you imagine riding around the streets of your hometown on a skateboard without wheels?In the late 1980s, film director Robert Zemeckis showed a skateboard floating above the ground in his movie Back To The Future Part II.Now, an American company, Arx Pax, has moved the idea for such a device from a futuristic dream to reality.The new product operates on the same rules that govern magnetism.When similarly charged ends of two magnets get close together, they repel or push away from each other.That force can make an object levitate or hover in space.Since the 1980s, levitation has been used on trains in Europe, Japan and China.These maglev trains, seem to float above the ground.There is no contact between the bottom of the cars and the surface of the train track.Maglev trains are almost noiseless and can move very fast.Greg Henderson says the same technology can make anything hover, even buildings."Imagine there's an earthquake and the early warning turns on the warning systems and the supports fall away as the building starts to hover.
