Interesting developments in that scientists, at Columbia University, have started to exploit small amounts of power from strange sources (http://www.theguardian.com/science/2015/jun/16/scientists-build-toy-car-propelled-by-evaporating-water). They have powered a miniature car and a flashing LED, harnessing the power of evaporating water. Even more strangely, they have developed an artificial 'muscle' (HYDRA) by sticking the spores from common soil bacteria, in a particular arrangement, to a tape. The spores greatly expand when exposed to water and shrink when dry, producing a spring-like movement. There seem to be lots of other possibilities for developing micro machines using these spores and water.
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