“Whether you measure miles of roadway or length of electrical cables, you find that all of these [measures of infrastructure necessary for a city] also decrease, per person, as city size increases. And all show an exponent between 0.7 and 0.9. Now comes the spooky part. The same law is true for living things. That is, if you mentally replace cities by organisms and city size by body weight, the mathematical pattern remains the same.”