
Geoffrey West, Santa Fe Institute:
“Sitting there, you are like a 90 watt bulb. Metabolic rate (B) sets the pace of life; it increases non-linearly with size (M). B ~ M^ ¾ over 8 orders of magnitude in scale, form the shrew to the huge blue whale. Heart rate scales as -1/4 power of body mass. The pace of life systematically slows with increasing size. Small animals live fast and die young.”
“As animals get bigger, pulse rates slow down and life spans stretch out longer, conspiring so that the number of heartbeats during an average stay on Earth tends to be roughly the same, around a billion. A mouse just uses them up more quickly than an elephant.”
“Why? Because of Networks.” [in this case, the fluid dynamics in branching cardio-pulmonary networks]
“Are cities like a forest? Forests have an extraordinary regular structure. Are cities and companies just very large organisms satisfying the laws of biology? Why do all companies die whereas almost all cities survive?”
“Doubling the size of a city systematically increases income, wealth, number of patents, number of colleges, number of creative people, number of police, crime rate, number of AIDS and flu cases, amount of waste, all by ~15% per capita regardless of city.”
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