When you go to the dentist, the discovery of cavities is bad news. But when you’re using a new scientific technique to scan for hitherto undiscovered secret rooms in the Great Pyramid of Giza, finding cavities is about as exciting as it gets. Last November, the Scan Pyramids research team, given special permission by the Egyptian government to use the non-invasive technique of bombarding the structure with sub-atomic particles, tracing their trajectories, and looking for temperature differences that suggest voids, or hidden rooms, within the pyramids. The Great Pyramid, unlike such burial monuments as King Tut’s Tomb, has never yielded any secret rooms, treasures or royal remains… but thanks to something called muograhy, that mystery may now be closer to being cracked. Look, ma! Some cavities! Check local listings.