If you saw grains of sand rolling uphill you might be forgiven for thinking you were watching a Christopher Nolan movie.
. But scientists have recently figured out how a sand-like material can be made to flow back up slopes, without rewinding time.iny particles they call microrollers by coating microscopic grains of polymethyl methacrylate plastic inActivating a rotating magnetic field near a sloped mound of the particles was found to exert a twisting force or
frameborder="0″ allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen> As a magnetic torque is applied to these microrollers they rotate around their axes, forcing the particles to temporarily come together and act in unison. This rolling and the subsequent cohesion allows the grains to climb up a slope.means more cohesion, the researchers report, so the grains gain more traction and move faster. The collective effects are impossible if the grains are simply operating independently.
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