Muons May Unlock Secrets of Teotihuacan If tombs are discovered in the Pyramid of the Sun, they could shed light on the governing style in the ancient city of Teotihuacan, Mexico. Does the Pyramid of the Sun harbor any tombs? What might such tombs reveal about the society that two millennia ago built one of Mesoamerica's largest pyramids? In an experiment à la Luis Alvarez, who in the late 1960s concluded that there are no tombs in Egypt's Chephren pyramid, a collaboration of physicists and archaeologists hopes to glean answers to these questions by monitoring the passage of muons through...