Not only is powering a Raspberry Pi with a steam engine incredibly impressive, its make a lot of sense to use during the winter in Sweden. A pair of propane blowtorches is used to heat the water to steam and the pressure created is used to turn a simple two cylinder engine which in turn is used to turn a simple DC electric motor which then powers the Pi. If the power goes out you might not be able to browse the internet on it, but this Pi will keep running as long as you have water and propane. You can follow the link from The Register for videos and notes, although they are in Swedish, hopefully Skype add that language to their instantaneous translation service soon.
"A Swedish schoolboy has built a miniature steam engine to power his Raspberry Pi. It is a piece of absolute engineering beauty."
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