P&G’s latest bet is Tide evo, a flexible three-inch “tile” made of six layers of compressed detergent fibers that dissolve in cold water. It took more than a decade and 50 patents to develop. The ...

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 ...