Philip Ball learns why the difficulty of stirring a bowl of sugar depends on the length of the spoon.
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References
Albert,I. et al. Jamming and fluctuations in granular drag. Physical Review Letters 84, 5122 - 5215 2000.
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Ball, P. Sawteeth in the sand. Nature (2000). https://doi.org/10.1038/news000615-7
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DOI: https://doi.org/10.1038/news000615-7