The Müller-Lyer illusion makes lines of equal length appear different.
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Terror management theory suggests much of human behavior is unconsciously driven by fear of death.
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The fundamental theorem of calculus connects differentiation and integration — two seemingly unrelated operations.
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Confirmation bias causes people to favor information that supports their existing beliefs.
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Cognitive dissonance — the discomfort of holding contradictory beliefs — drives people to rationalize rather than change behavior.
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Climber Reinhold Messner was the first to summit all 14 peaks above 8,000 meters, all without supplemental oxygen.
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The placebo effect can produce measurable physiological changes.
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Flow state, described by psychologist Mihaly Csikszentmihalyi, is a mental state of complete absorption in a challenging activity.
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The Dunning-Kruger effect: people with limited knowledge tend to overestimate their own competence.
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