Economists think about what people ought to do. Psychologists watch what they actually do.

Groups tend to be more extreme than individuals.

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

Facts that challenge basic assumptions-and thereby threaten people's livelihood and self-esteem-are simply not absorbed. The mind does not digest them.

Each additional day together is a gift. The end of the day means the end of hostilities, the recognition that the underlying shared values and commitment to the relationship trump the need for one last dig or self-righteous justification.

People are really happier with friends than they are with their families or their spouse or their child.

Political columnists and sports pundits are rewarded for being overconfident.