How We Know What Isn't So: The Fallibility of Human Reason in Everyday Life

Thomas Gilovich examines why humans form questionable beliefs through research and examples of cognitive biases that distort perceptions, such as seeing patterns in randomness, misinterpreting incomplete data, and favoring confirming evidence.

The book highlights pitfalls like post-hoc reasoning, the illusion of validity, and the influence of motives on belief, offering heuristics like considering sources, trusting facts over projections, and seeking disconfirming evidence to improve reasoning.