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Summary: nature physics | ADVANCE ONLINE PUBLICATION | www.nature.com/naturephysics 1
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I
nterdisciplinary theoretical physics is a
difficult business. Frequently physicists
who work outside of the traditional realm
of physics are ignored or misunderstood
by those whose fields they plough --
biologists, economists, social scientists,
to name but a few. Similarly, all too often
their work is labelled as `nice, but not
physics' by conservative peers in the
physics community. But the candid model
for human mobility that Chaoming Song
and colleagues report1
in Nature Physics is
unlikely to suffer this fate. Starting from
random-walk processes, and taking on
board elements from the theory of scale-
free networks, they arrive at a conceptually
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