“This must have happened to you: it’s the end of the day, you need to make an urgent call, your mobile phone’s battery is down, and you are nowhere near an electricity socket.
With the ‘GoGoPower,’ a wind-up mobile phone charger, you could make that call. Five minutes of winding the handle will give a mobile phone 20 minutes of power.”
My wife complains that (1) I spend too much time on the computer, and (2) I don’t get enough exercise. Hook one of these up to a stationary bike, and you could power your laptop. This is a solution to all her problems.