I wonder if the author is certain about this:

On Being Certain: Believing You are Right Even When You are Wrong: The day after the 1986 Challenger shuttle accident, psychologist Ulric Neisser asked 106 students to write down exactly where they were and what they were doing when they first heard about the explosion. When he interviewed the students two and a half years later, 25 percent of them gave strikingly different accounts. But when confronted with their original journal entries, many students defended their beliefs. One of them answered, “That’s my handwriting, but that’s not what happened.” ...

Robert A. Burton tries to get to the bottom of the curious sensation he calls the “feeling of knowing”—being certain of a fact despite having no (or even contrary) evidence. Throughout his book, Burton makes the compelling argument that certainty “is neither a conscious choice nor even a thought process.” Instead, he says, that unmistakable sense of certainty “arises out of involuntary brain mechanisms that, like love or anger, function independently of reason.”

Burton thinks that just as we perceive our external world through our physical senses, our internal world presents itself in the form of feelings, such as familiar or strange and correct or incorrect. And he shows that these inner perceptions are necessary for us to function properly in everyday life, because our thoughts are subject to constant self-questioning. For example, even though reason may tell us that running up a tree to escape a lion is an excellent strategy, experience shows that great strategies can fail and that there may be better options. Because alternative choices are present in any situation, logical thought alone would be doomed to a perpetual “yes, but” questioning routine. Burton reasons that it is the feeling of knowing that solves this dilemma of how to reach a conclusion. Without this “circuit breaker,” indecision and inaction would rule the day.

One of the startling implications of Burton’s thesis is that we ultimately cannot trust ourselves when we believe we know something to be true. “We can’t afford to continue with the outdated claims of a perfectly rational unconscious or knowing when we can trust gut feelings,” he writes. ...