The universe is a grand book, Galileo noted in 1623, written in the language of mathematics (1). Those poor souls who don’t understand that language, he cautioned, wander about in a “dark labyrinth.” As languages go, mathematics can be intimidating. Plenty of people linger in the shade of Galileo’s labyrinth. To the uninitiated, equations, theorems, and proofs—to say nothing of their constituen...