It all started with beavers. When Alex Pentland was three years into his undergraduate degree at the University of Michigan, in 1973, he worked part-time as a computer programmer for NASA’s Environmental Research Institute. One of his first tasks — part of a larger environmental-monitoring project — was to develop a method for counting Canadian beavers from outer space. There was just one problem: existing satellites were crude, and beavers are small. “What beavers do is they create ponds,”...
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