That's foot power not powder!
We underestimate the amount of energy that is expended walking around day after day. I believe there are two ways we could harness some of the energy we lose from walking, in the shoe and in the floor.
If we put some mechanism in a person's shoe which outputted electricity when compressed this energy could be stored in a battery for emergency use. This might be a problem however because the mechanism would need to be very small as would the battery.
Putting this same type of mechanism in the floor would eliminate the size restraint and allow for much larger amounts of power to be harnessed. This could be installed in businesses where there would be some upfront cost for installation but the return would be great enough to pay for the cost in some nominal amount of time.
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