Mixing corn starch and water makes for a crowd-pleasing staple of science demos. The resulting substance looks like a liquid, but hardens instantly when you punch it—in fact, it’s possible to run across a pool of the stuff. Now physicists think they’ve figured out just what’s going on when this unusual material switches from a liquid to a solid, hopefully ending a long-running debate. They described their findings in a new paper in Physical Review Letters.
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