MASON, Ohio—As the nation’s dominant purveyor of laundry detergent, Procter & Gamble PG-1.22%decrease; down pointing triangle knows full well that consumers have strong feelings about their wash.
EcoStep is a real high-school engineering prototype that uses a 4 x 4 array of 16 PZT piezoelectric elements inside a layered compression tile to study footstep energy harvesting with ...
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