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Challenge your brain with math! Using nothing more than basic arithmetic and logic, you'll be thrilled as answers slot into place. Whether purely for fun or to test your knowledge, you'll sharpen your problem-solving skills and flex your mental muscles. All you need is logical thought, a little patience, and a clear mind.

Produktbeschreibung
Challenge your brain with math! Using nothing more than basic arithmetic and logic, you'll be thrilled as answers slot into place. Whether purely for fun or to test your knowledge, you'll sharpen your problem-solving skills and flex your mental muscles. All you need is logical thought, a little patience, and a clear mind.
Autorenporträt
Erica Sadun enjoys math, puzzles, and deep dives into technology. She's worked in programming, teaching, and developer outreach. She has written, co-written, and contributed to dozens of books about a variety of tech topics, and blogged at TUAW, Ars Technica, O'Reilly, and Lifehacker.