Carlo Rovelli takes us into the heart of a black hole, where space and time dissolve and a white hole is born. As a theoretical physicist, Rovelli has devoted his career to bridging the gap between Einstein's time-warping relativity theory and the unpredictability of quantum mechanics. In "White Holes," the beloved author of the internationally best-selling "The Order of Time," and "Seven Brief Lessons on Physics" returns to the subjects that fascinate him most: time and impermanence, which he says have brought him a kind of serenity.