In Mysterious Pattern, Math and Nature Converge Marco de LeijaIn Cuernavaca, Mexico, a “spy” network makes the decentralized bus system more efficient. As a consequence, the departure times of buses exhibit a ubiquitous pattern known as “universality.” By: Natalie WolchoverFebruary 5, 2013 Comments (1) print In 1999, while sitting at a bus stop in Cuernavaca, Mexico, a Czech physicist named Petr Šeba noticed young men handing slips of paper to the bus drivers in exchange for cash. It wasn’t organized crime, he learned, but another shadow trade: Each driver paid a “spy” to record when the bus ahead of his...