Here is an extract from our new book The Scientists, about the life and work of Alan Turing. This book tells the remarkable lives of the pioneers of science – from Galileo and Newton, Faraday and Darwin, Pasteur and Marie Curie, to Einstein, Freud, Turing and Crick and Watson. Often unorthodox thinkers, these scientists frequently had to struggle to gain recognition for their work, in order to leave their legacy to future generations.