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Human cognition, despite its remarkable capabilities, is susceptible to systematic errors in thinking known as cognitive biases. These are not random misjudgments but rather predictable patterns of deviation from rational judgment. One pervasive example is confirmation bias, the tendency to search for, interpret, favor, and recall information in a way that confirms or supports one's preexisting beliefs. This can lead to flawed decision-making, as individuals may disregard evidence that contradicts their initial standpoint.
Another potent bias is the availability heuristic, where people overestimate the importance of information that is readily available to them. A person might argue that smoking is not unhealthy because they know someone who smoked for decades and lived to be 90. This anecdotal evidence is more vivid and easily recalled than statistical data from medical studies. Understanding these inherent biases is the first step toward metacognition—thinking about one's own thinking—and can lead to more objective and rational outcomes.