With nothing more than beads in a glass box, physicists have revealed yet another mysterious property of granular solids, now recognized by scientists as a unique state of matter, like solids or gases...Found at Wired Science, where there is more information and additional links.
But when they filled the box nearly to the top — which, they expected, would cause the beads to clog — the beads instead moved in graceful, swirling currents.
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