The Copenhagen Wheel

Here is a very cool new invention from the folks over at MIT.  It is a motorized rear wheel that will fit into a standard bike frame without modification.  Basically, it is intended to give you a little gas going up and over the hills.  What is great about it is that it uses your energy from pedaling and braking to charge the motor.  Also, it hooks up to a smart phone and gives you feedback on speed, calroies burned, etc.  This will allow folks just starting out on the bike and who may not be in the best shape to get on the bike and go.  Very cool!