Gerd Gigerenzer and Daniel Goldstein discovered that the heuristic did surprisingly well at making accurate inferences in real-world environments, such as inferring which of two cities is larger. The heuristic has since been modified and applied to domains from medicine to artificial intelligence.
Gracious Guadalajara: a city of tradition, fitness fanatics "take the cure" at Huentitan Canyon. (annual race at Huentitan Canyon attracts fitness fanatics each year) (includes related article on Puerto Vallarta)
Nov 01, 1991; I should've known. Sure, the sign at the top of Huentitan Canyon started out innocently enough: "Barranca de...