One factor that certainly is not involved is stupidity. Researchers at Yale University have shown that educated people are more unshakable in their convictions than anybody.2 After all, an education gives you tools to defend your opinions. Intelligent people are highly practiced in finding arguments, experts, and studies that underpin their preexisting beliefs, and the Internet has made it easier than ever to be consumers of our own opinions, with another piece of evidence always just a mouse-click away. Smart people, concludes the American journalist Ezra Klein, don’t use their intellect to
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