CARLO ROVELLI received his PhD in physics at the University of Padua. He has conducted research at Imperial College,Yale University, the University of Rome, and the University of Pittsburgh, and currently directs the quantum gravity group of the Center for Theoretical Physics at Aix-Marseille University. He is author of Quantum Gravity and What Is Time? What Is Space?, as well as many scholarly articles. His most recent book, Seven Brief Lessons on Physics,translated into thirty-four languages, is an international bestseller.