The author has classified human's thinking methods into two categories—System 1, which is intuitive, fast, and automatic; System 2, which is deliberate, slow, but sometimes powerful and more logical.
Humans tend to use Sys 1 instead of Sys 2 because it consumes less energy. If something can't be done solely under Sys 1, Sys 2 will take over.
The preference of the two systems seems to be related to intelligence.
— 20 hours, 21 min ago
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