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"Artists Christian Croft and Kate Hartman hacked a Heely rolling sneaker to \"transform it into a platform for generating electricity from human motion.\" That's the hacking, now the art: "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/renewable-energy/energy-harvesting-rolling-sneaker-recharges-your-routine.html>