What is a model? Explanatory power, prediction, and the art of knowing the limits There is a map of the London Underground that has been reproduced more than a billion times. It hangs in train carriages and ticket halls, appears on tourist guides and phone screens, and is recognized by more people worldwide than almost… Read more

There is an experiment that every reader of this article can conduct right now, without equipment or preparation. Hold this page at normal reading distance and focus on the word at the center of the line you are currently reading. Without moving your eyes, try to make out the words at the far left and… Read more