Instead, Professor Kahneman favored an alternative that he termed “adversarial collaboration.” When people who disagree work together to test a hypothesis, they are involved in a common endeavor. They are trying not to win, but to figure out what’s true. They might even become friends.

Popper introduced the mechanism of conjectures and refutations, which works as follows: you formulate a (bold) conjecture and you start looking for the observation that would prove you wrong. This is the alternative to our search for confirmatory instances. If you think the task is easy, you will be disappointed—few humans have a natural ability to

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