Speaking of the Limits of Understanding “Correlations of about .20 (PC = 56%) are quite common in human affairs.” “Correlation does not imply causation, but causation does imply correlation.” “Most normal events are neither expected nor surprising, and they require no explanation.” “In the valley of the normal, events are neither expected nor surprising—they just explain themselves.” “We think we understand what is going on here, but could we have predicted it?”
