His pet hamster, Elvis, does the legwork while Peter charges his phone in an economically and environmentally friendly way. Peter came up with the idea after his sister Sarah complained that Elvis was keeping her awake at night by playing for hours on his exercise wheel.
"I thought the wheel could be made to do something useful so I connected a system of gears and a turbine," he said. "Every two minutes Elvis spends on his wheel gives me about thirty minutes talk time on my phone."
This is great idea and seems like a doable DIY - if it can work for a cell phone, it could also be used to power other small electronics such as an iPOD, lights, cameras, etc.
Unfortunately, Peter’s teacher didn’t appreciate the ingenuity of his project and he was only given a C grade for his project.
Via Treehugger, Ananova