The reasons why mixtures of sand and pebbles seem to separate when shaken vigorously have been illuminated by an intriguing simulation which, among other things, suggests that only large pebbles behave in this way.
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Maddox, J. Why pebbles float to the surface. Nature 358, 535 (1992). https://doi.org/10.1038/358535a0
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DOI: https://doi.org/10.1038/358535a0
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