“It’s No Wonder We’re Exhausted” Over the past 150,000 years, Homo sapiens evolved in a world that was “local and linear,” but today’s environment is “global and exponential.” In our ancestor’s local environment, most everything that happened in their day happened within a day’s walk. In their linear environment, change was excruciatingly slow—life from one generation to the next was effectively the same—and what change did arrive always followed a linear progression. To give you a sense of the difference, if I take thirty linear steps (calling one step a meter) from the front door of my Santa
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