Kernphysik mit Kikka - Die wunderbare Welt von Isotopp
After two years of analysis, West and Bettencourt discovered that all of these urban variables could be described by a few exquisitely simple equations. For example, if they know the population of a metropolitan area in a given country, they can estimate, with approximately 85 percent accuracy, its average income and the dimensions of its sewer system.
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Lexikon des Unendlichen: Unendlichkeit, Ewigkeit und Unbegrenztheit in Physik, Astronomie, Mathematik, Philosophie und Religion