How the 'hoverboards' took off - in spite of laws against them

They're known variously as "hoverboards" or "rideables" and are the latest must-have at the feet of celebrities - but the Crown Prosecution Service says riding them on public UK roads is illegal. What is this futuristic new breed of transportation - and how practical is it? Within five minutes, the teenagers begin to circle. They are drawn, camera phone first, by the contraption at my feet.
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