Could a 16-year-old Irish girl make a major advancement in the highly cerebral field of cryptography? It seemed as if Sarah Flannery might have done it with her 1999 science fair project, and when the London Times put a story about her project on the front page, she might as well have. This a great story about the strange places mathematical curiosity can take you. I’m happy events conspired to bring Sarah’s projects and this book into existence.