Smolin, a leading figure in the fight to reinstate realism as the bedrock of science, insists that now is the right time to take up arms. “Science is under attack,” he writes in Einstein’s Unfinished Revolution, “and with it the belief in a real world in which facts are either true or false . . . when fundamental physics itself gets hijacked by an anti-realist philosophy, we are in danger.” The risk, he warns, is the surrender of the centuries-old project of realism, “which is nothing less than the continual adjustment, bit by bit, as knowledge progresses, of the boundary between our knowledge of reality and the realm of fantasy.” Smolin offers a masterful exposition on the state of quantum physics, smoothly blending a history of the field with clear explanations, philosophical context and an accessible introduction to fresh ideas. His narrative on how two competing perspectives on quantum behaviour hardened into Bohr’s counter-intuitive orthodoxy, is spellbinding.