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Letter: Pervasive spread

Published 8 January 2014

From Donald Windsor

I disagree with Luís Bettencourt’s comparison of cities to stars (14 December 2013, p 30). A city is more like a colony of bacteria in a biofilm than it is like a star.
Norwich, New York, US

Issue no. 2951 published 11 January 2014

Â鶹´«Ã½ issue 2951 cover

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