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When is a supersolid not quite so super?

Brown University physicist Humphrey Maris and colleagues Satoshi Sasaki and Sebastien Balibar of the l'Ecole Normale Supérieure have narrowed the field of possible explanations for the weird behavior of supersolid helium. Their simple but extremely revealing experiment suggests that movement along grain boundaries is a more plausible explanation than Bose-Einstein condensates.

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