John von Neumann is one of the most influential scientists to have ever lived. He was instrumental in the Manhattan Project and helped formulate the bedrock of Cold War geopolitics and modern economic theory. He created the first ever programmable digital computer. He prophesied the potential of nanotechnology and, from his deathbed, expounded on the limits of brains and computers - and how they might be overcome. Ananyo Bhattacharya explores how Neumann swept through so many different fields of science, sparking revolutions wherever he went.