In the Amazonian region of Brazil, where anthropologist Caleb Everett spent much of his childhood, speakers of Tupi-Kawahíb never refer to time ‘passing by.’ Indeed, the language has no word for ‘time.’ By contrast, most European languages have few abstract words for odours, whereas languages in a number of other cultures have more than a dozen. Everett’s fascinating book—based on collaboration with biologists, chemists, political scientists and engineers—ponders such differences between the world’s 7,000-plus languages.