Phew! It should come as no surprise that the MHC stages are hidden in plain sight. When the underlying order in the chaos is so difficult to see, it can be very tempting to conclude that the world is simply fussy, disordered—and even to wear that skeptical conclusion as a badge of anti-reductionist honor, as a mark of our own open-mindedness, humility and spirituality. But there is nothing open-minded, humble or spiritual in failing to see—and properly respond to—the undeniable regularities in human behavior that are revealed by the elegant but merciless simplicity of experimental, empirical
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