npr:

The idea that an ugly face might hide a subtle mind has attracted scientific inquiries for many years. At first, scientists wanted to know whether it was possible to read someone’s intelligence from the shape of his face. In 1918, a researcher in Ohio showed a dozen photographic portraits of well-dressed children to a group of physicians and teachers, and asked the adults to rank the kids from smartest to dumbest. A couple of years later, a Pittsburgh psychologist ran a similar experiment using headshots of 69 employees from a department store. In both studies, seemingly naive guesses were compared to actual test scores, and turned out to be accurate more often than not.