The discovery that parts of a solid helium crystal could flow through other parts without friction ignited physicists' interest. Independent experiments confirm this unusual superflow, but its origin remains mysterious.
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Glyde, H. Defects and perfect flows. Nature 444, 693–695 (2006). https://doi.org/10.1038/444693a
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DOI: https://doi.org/10.1038/444693a
