As he did in his elegant Seven Brief Lessons on Physics, Rovelli here makes theoretical physics accessible. And it’s amazing. He includes equations, but don’t worry about those (even Einstein needed help with the math); the beauty of his explanations is their simplicity. Defining reality as “a world of vibrations, a continuous fluctuation,” he boils everything down to three essentials: granularity, indeterminism, and relationality. These provide all you need to understand why space is not the continuity we take it for, why time is “information we don’t have,” why there’s no such thing as infinity—and much more, including what the universe might have been before the Big Bang.