People are very good [at] thinking about agents. The mind is set really beautifully to think about agents. Agents have traits. Agents have behaviors. We understand agents. We form global impression of their personalities. We are really not very good at remembering sentences where the subject of the sentence is an abstract notion.

A large portion of the weekend effects is explained by differences in the amount of time spent with friends or family between weekends and weekdays.

We are far too willing to reject the belief that much of what we see in life is random.

Mood evidently affects the operation of System 1: when we are uncomfortable and unhappy, we lose touch with our intuition. These findings add to the growing evidence that good mood, intuition, creativity, gullibility, and increased reliance on System 1 form a cluster. At the other pole, sadness, vigilance, suspicion, an analytic approach, and increased effort also go together. A happy mood loosens the control of System 2 over performance: when in a good mood, people become more intuitive and more creative but also less vigilant and more prone to logical errors.

This is the essence of intuitive heuristics: when faced with a difficult question, we often answer an easier one instead, usually without noticing the substitution.

We have no reason to expect the quality of intuition to improve with the importance of the problem. Perhaps the contrary: high-stake problems are likely to involve powerful emotions and strong impulses to action.

One of the problems with expertise is that people have it in some domains and not in others.