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“Scientism” is the belief that all we need to solve the world’s problems is, you guessed it, science. People sometimes sub in the phrase rational thinking, but it amounts to the same thing. If only people would drop religion and all their other prejudices, we could use logic to fix everything.

Last week, Neil deGrasse Tyson offered up the perfect example of scientism when he proposed a country of #Rationalia, in which “all policy shall be based on the weight of evidence.”

Tyson is a very smart man, but this is a very stupid tweet, and a very stupid idea. It is even, we might say, unreasonable and without sufficient evidence. Of course imagining a society in which all actors behave logically sounds appealing. But employing logic to consider the concept reveals that there could be no such thing.

There has always been a hope, especially as elites became less religious, that science would do more than simply provide a means for learning about the world around us. Science should also teach us how to live, pointing us...