The tracking of the circulation of dollar bills around the United States, to map human travel patterns, has at last uncovered a physical example of a particular style of random walk.
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Shlesinger, M. Follow the money. Nature Phys 2, 69–70 (2006). https://doi.org/10.1038/nphys221
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DOI: https://doi.org/10.1038/nphys221
