Everybody needs one of these under their tree or menorah: A team of scientists at MIT has developed a new, more energy efficient bicycle wheel that gives riders a boost when they need it. Similar to a hybrid car, the Copenhagen Wheel harvests energy when rolling and braking, and uses that stored energy to power the bike. For a bit more WOW factor, your iPhone can wirelessly connect to sensors in the wheel to lock/unlock your bike, change gears, select how much the motor assists you and viewing real-time info about energy usage, maps and pollution. Cool! Take a look at it in action:
