 While Condorcet’s jury theorem largely falls into oblivion after his death, the mathematical take on aggregation which he had initiated remains. Francis Galton, for example, stumbles over useful data for testing the epistemic performance of belief aggregation when visiting a cattle fair in 1906. Galton observes a weight-judging competition: participants were asked to guess the slaughtering weight of an ox, submitting their guesses in writing. To Galton’s surprise, the median guess was within 0.8% of the actual weight, beating by far the individual judgments. While Galton does not directly invoke a jury theorem, he notes that