Can you reinvent the wheel?
Well these scientists seem to think so..
A team of scientists from an American university say they have reinvented the bicycle wheel.
The Copenhagen Wheel is a hub containing motor and batteries which can be fitted to the rear wheel of almost any bike, providing a boost to the cyclist whenever needed, say developers.
It has been unveiled at the UN Climate Summit by the team from the Massachusetts Institute of Technology.
View the vid here:
http://news.bbc.co.uk/1/hi/sci/tech/8415379.stm
I want one