A report by Kari HauschkeItalian physicist Monica Pepe-Altarelli is one of thousands of scientists from around the world who work at CERN. She is the director of the LHCb experiment and along with her colleagues is hoping to discover why the universe is primarily composed of matter, and not anti-matter.What drives the experimental physicist, who originally wanted to become an architect? What’s it like working on the largest experiment in the world? And how does a team from the four corners of the earth cooperate to get the job done? A portrait.