The interest earned on a Bank account, the arrangement of seeds in a sunflower, and the shape of the gateway Arch in St. Louis are all intimately connected with the mysterious number e. In this informal and engaging history, Eli Maor portrays the curious characters and the elegant Mathematics that lie behind the number. Designed for a reader with only a modest mathematical background, this biography brings out the central importance of e to Mathematics and illuminates a golden era in the age of science. "This is a gently paced, elegantly composed book, and it will bring its readers much pleasure.... Maor has written an excellent book that should be in every public and school library."--Ian Stewart, new scientist "Maor wonderfully tells the story of e. The chronological history allows excursions into the lives of people involved with the development of this fascinating number. Maor hangs his story on a string of people stretching from Archimedes to David Hilbert. And by presenting Mathematics in terms of the humans who produced it, he places the subject where it belongs--squarely in the centre of the humanities."--Jerry br. King, nature.