"Over millions of generations, the selective pressure of life- or- death worked through our ancestors’ genes to create the human brain that produces our behavior.

"Natural selection, the primary driver of evolution, gave us abstract thought, language, and the memory- prediction framework, new adaptations in human beings that were critically important for our evolutionary success. 

"These adaptations have endowed us with the power to change our behavior within a single lifespan, in response to immediate environmental challenges and the anticipation of new challenges in the future.

"Natural selection also gave us heuristics, cognitive shortcuts, behavioral biases, and other conscious and unconscious rules of thumb--the adaptations that we make at the speed of thought.  

"Natural selection isn’t interested in exact solutions and optimal behavior, features of Homo economicus."