“Two Systems of Knowing In his book Thinking, Fast and Slow, Daniel Kahneman describes our two analytic systems. What he calls System 1 (or the automatic system) is unconscious, intuitive, and immediate. It draws on our senses and memories to size up a situation in the blink of an eye. It’s the running back dodging tackles in his dash for the end zone. It’s the Minneapolis cop, walking up to a driver he’s pulled over on a chilly day, taking evasive action even before he’s fully aware that his eye has seen a bead of sweat run down the driver’s temple.”