As Americans’ new machines were recording reality with ever more precision, irrationality and even superstition were on the rise. This is not as paradoxical as it sounds. Acquired knowledge obeys a Malthusian logic: Each new fact brings a handful of new questions, which, when answered, bring a handful more. Facts grow arithmetically, but questions grow geometrically. The result is a deterioration of certitude. The closer we get to the truth, the less confident we are in our possession of it.

