Two heads are better than one. Cathy Newman rewrites the history books to expose the strange power of two - the reason Holmes and Watson need to come as a pair, and Apple could not have been started by Steve Jobs alone. Bringing together an extraordinary range of stories from around the world, Newman shows how double acts have relied on each other, how minds have married to usher in miraculous discoveries, and how those we think of as lone geniuses often did not work solo. Print run 10,000.