操场发电机——当看着一大群10岁的孩子们在操场上撒丫子奔跑时，老师有时会想：“为什么不把这些小捣蛋们的能量更好地利用起来呢？”这些适合设于贫困区域的操场上的新发明将孩子们旋转转轮及木马时产生的动力转变为抽水机或其它基本事项的能源。

    7) Hand-Cranked Radios – These were invented by Trevor Baylis, a true British eccentric and inventor who, after a career as a swimmer and stuntman, decided to find a way to communicate information about AIDS and other diseases to poor people in Africa. Realising they didn't have the electricity for regular radios, he devised a cheap and easily-made wind-up radio which could be powered just by turning a handle. His inventions are now being sold in the West – a few turns on a handle every half-hour will save you energy and money. And now there are even wind-up MP3 players! You'll never go without music on a long train ride again.

    手动曲柄收音机——这是由特勒佛•贝里斯发明的 ......