It is $49.99 on Amazon. While purists complain about the edits, it is 98% Harold Jacobs. It retains the photos, the witty captions, and the discovery method. It also comes with a teacher's guide (which the older versions lacked).
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Each chapter is divided into manageable lessons followed by three sets of exercises. Set I reviews previous concepts. Set II focuses on the day's lesson with escalating difficulty. Set III offers a "brainteaser" challenge designed to stretch advanced thinkers. Comparing the Editions: 2nd Edition vs. 3rd Edition It is $49