The Man of Numbers by Keith Devlin. 2011, ISBN 978-0-8027-7812-3. Subtitled: Fibonacci's Arithmetic Revolution. This book is about Leonardo of Pisa aka Fibonacci. The book is well written. However, not much is known about Fibonacci, so it is a bit thin. The book describes Fibonacci's contribution to the western world as one of making the Hindu-Arabic number system more available to merchants and bankers in medieval Italy. Fibonacci did this through his book Liber Abbaci (the Book of Calculation). The book introduces the Hindu-Arabic numbers and how to do calculations with them. It does this mostly by presenting story problems that would be easy to understand or were relevant to the merchants of that time. The book also introduces algebraic ideas concerning how to solve story problems. Today the name Fibonacci is associated with Fibonacci Numbers. This because this number sequence appears in Liber Abbaci (see page 404, Liber Abaci, translated by L. E. Sigler) in a story about rabbits. The story, like the many other stories in the book, is intended as a way to use the number system to do math problems and not as a treatise on rabbit biology (or Fibonacci numbers either.) Purchased at Powell's books, 9-6-2011 for $25.00.