Imagine a fluid that flows both perfectly and not at all. A Zen master might pose such a riddle, but in a new theoretical proof, physicists have shown that such a paradoxical state of matter can indeed exist.
It’s called a superglass — “super” in the same sense as superconductors and superfluids, which is to say that quantum weirdness lurks.
A superglass would look and feel just like a normal glassy solid. As in regular glass, the atoms in a superglass would be arranged randomly — instead of in a crystalline lattice — because a glass is essentially a liquid that has ceased to flow.
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