Many people get their first introduction to Lady Ada Lovelace, daughter of poet Lord Byron and companion to Charles Babbage, in William Gibsonand and Bruce Sterling's groundbreaking The Difference Engine. It's easy to imagine why Gibson and Sterling chose to weave her into their 1991 thriller, portraying her as the enigmatic, iconic Queen of Engines. Inspired by the real-life Lady Ada, the character is sharp, strong-minded, and eccentric.

Betty Alexander Toole's Ada, the Enchantress of Numbers bears out this view. By presenting and annotating more than 25 years of correspondence from Ada, Toole paints an endearing portrait of an inarguably remarkable woman, called by some--perhaps a bit gushingly--"the world's first hacker," because of her work with computing pioneer Charles Babbage. Although the reams of lovingly transcribed letters provide an intimate and material look at Ada's life, the accompanying analysis isn't always as useful, with objectivity taking a back seat to adoration at times. The up side of this enthusiasm is that you'd be hard pressed to find a better start for learning more about the fascinating Ada; her letters are complemented by a detailed timeline, glossary, bibliography, index, online references, and even discussion questions. --Paul Hughes

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