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Mucking about with the revolving door creates free electricity - Tech Digest
Continuing today's impromptu self-powering theme we have this from Fluxxlab. It's a method of generating power for your home - or someone else's office - by fitting a little charger to a revolving door. So as you and your gerbil-like friends and employees turn the door, a flood of free electricity charges up all your batteries and keeps your stuff switched on for free...