My desk, like the desk of most research scientists, sees an overwhelming traffic of scholarly journals and articles—reams of pages of the latest cutting-edge discoveries, destined to be outdated before next week. But one study, A Cross-Cultural Summary, written in 1967 by the Stanford anthropologist Robert Textor, has remained firmly planted there for some time now—and not only because, at 3,000 pages long, it’s rather hard to pick up and move. Textor’s massive tome contains a cultural correlation that bears disquietingly on the type of planet we humans have produced for ourselves today, and my mind turns to it more and more of late.