Two things have happened to me as I've aged, and I'm not talking about the deplorable decreases in my bicycling and running speeds. First, I've become better at spotting ideology. Second, I've become less tolerant of it. By "ideology," I mean a hermetically sealed worldview, one that filters out all and only disconfirming data. Ideologues, by definition, are closed-minded and dogmatic. They have no reality-testing mechanism. Evidence and argument of the sort philosophers and scientists take for granted have no effect on them. Indeed, the very standards of evidence and argument they employ are calculated to reduce their cognitive dissonance...