I have for a long time wanted a computer (and mobile phone etc) that did not require constant re-charging as the battery got flat. Given that perpetual motion seems to be off the cards (I blame the second law of thermodynamics personally) there is a need for an alternative. Solar energy is a problem with PCs, as when they are in use most of the visible area is either screen or keyboard. Windup computers are quite hard work, so this may be the solution.
http://www.abc.net.au/science/news/health/HealthRepublish_1438430.htm
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