📖 Overview
How We Know What Isn't So examines the ways humans develop and maintain false beliefs, drawing from research in psychology, statistics, and cognitive science. The book breaks down common errors in reasoning and judgment that lead people to accept and defend mistaken ideas.
Through real-world examples and scientific studies, Gilovich explores confirmation bias, pattern recognition errors, and the tendency to seek meaning in random events. The text addresses topics ranging from sports superstitions to medical misconceptions, demonstrating how these cognitive pitfalls manifest in daily life.
Each chapter builds a framework for understanding why smart people believe things that aren't true, while offering practical insights for better decision-making. The material moves from individual cognitive biases to broader social and cultural factors that reinforce false beliefs.
The work stands as an essential examination of human reasoning, challenging readers to confront their own susceptibility to flawed thinking patterns. Its enduring relevance speaks to fundamental questions about knowledge, belief, and the universal human drive to make sense of the world.
👀 Reviews
Readers value this book's clear explanations of common cognitive biases and logical fallacies. Many note its accessibility for non-academic readers while maintaining scientific rigor.
What readers liked:
- Practical examples from everyday life
- Balance of research and readability
- Enduring relevance despite being written in 1991
- Helps identify personal biases and flawed thinking
What readers disliked:
- Some sections feel repetitive
- Sports examples overused
- Academic tone in certain chapters
- Could use updated examples
A common critique is that the baseball statistics and ESP research examples feel dated. Several readers mention the book could benefit from a revised edition with contemporary cases.
Ratings:
Goodreads: 4.0/5 (3,800+ ratings)
Amazon: 4.5/5 (280+ ratings)
Representative review: "Excellent primer on how we fool ourselves. Could use fresher examples but the core insights remain valuable." - Goodreads reviewer
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Why People Believe Weird Things by Michael Shermer This investigation into pseudoscience, superstition, and other confusions of our time reveals the psychological mechanisms behind false beliefs.
Mistakes Were Made (But Not by Me) by Carol Tavris, Elliot Aronson The book examines self-justification and cognitive dissonance as root causes for people maintaining false beliefs despite contradictory evidence.
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Why People Believe Weird Things by Michael Shermer This investigation into pseudoscience, superstition, and other confusions of our time reveals the psychological mechanisms behind false beliefs.
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🤔 Interesting facts
🔍 Thomas Gilovich is a professor at Cornell University where he has taught for over 40 years and runs the Cornell Thinking Lab, dedicated to studying human judgment and decision-making.
📚 The book was first published in 1991 but remains highly influential in psychology and skepticism circles, often cited alongside works by Daniel Kahneman and Amos Tversky.
🧠 The "hot hand fallacy" discussed in the book was discovered by Gilovich through his analysis of basketball shooting statistics, showing that belief in "streak shooting" is largely a cognitive illusion.
💭 Many of the cognitive biases described in the book were later incorporated into behavioral economics theories that won the Nobel Prize in Economics (awarded to Daniel Kahneman in 2002).
🎓 The research presented in the book has been used to develop critical thinking courses at universities worldwide and has influenced how medical schools teach doctors to avoid diagnostic errors.