If you have ever wondered about the imaginative, wondrous side of science – for instance, how Einstein used maths to predict the existence of gravitational waves, or how a metaphor led to the astonishing discovery that the spinning earth drags space-time around it like molasses around a spoon, this is not the book for you. But if you want to know why scientists had the patience to keep refining their experiments until they detected this barely perceptible rippling of space-time, or why they have the kind of grit made legendary by Marie and Pierre Curie, sifting through tonnes of pitchblende for a speck of radium, you will find an intriguing, bold, and controversial answer in The Knowledge Machine.