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What makes mathematics so special? Whether you have anxious memories of the subject from school, or solve quadratic equations for fun, David Acheson's book will make you look at mathematics afresh. Following on from his previous bestsellers, The Calculus Story and The Wonder Book of Geometry, here Acheson highlights the power of algebra, combining it with arithmetic and geometry to capture the spirit of mathematics. This short book encompasses an astonishing array of ideas and concepts, from number tricks and magic squares to infinite series and imaginary numbers. Acheson's enthusiasm is infectious, and, as ever, a sense of quirkiness and fun pervades the book. But it also seeks to crystallize what is special about mathematics: the delight of discovery; the importance of proof; and the joy of contemplating an elegant solution. Using only the simplest of materials, it conjures up the depth and the magic of the subject.

With practical information aimed at home DIYers, author Tyler Baras (Farmer Tyler to his fans) shows exactly how to build, plant, and maintain over a dozen unique hydroponic systems, some costing just a few dollars to make. No soil? No sunlight? No problem. A hydroponic growing system gives you the power to grow plants anywhere. Even if you live in an area where water is scarce, a hydroponic system is the answer you've been looking for. Hydroponic systems are sealed and do not allow evaporation, making water loss virtually nonexistent. Simply suspend your essential nutrients in a water-based solution and circulate them to the plant roots in a contained network of vessels and tubes. This accessible guide provides the solid information you need for hydroponic gardening success. Farmer Tyler shows you, with detailed step-by-step photos, precisely how to create these systems, and how to plant and maintain them. All the information you need to get started with your home hydroponic system is included: Recipes for nutrient solutions Light and ventilation sources Comprehensive equipment guide Growing and maintenance instructions 12+ hydroponic system builds Complete crop selection charts DIY Hydroponic Gardens is the best resource available for getting started in hydroponics.

Want to sharpen your mathematical wits? If so, then Mathematical Conundrums is for you. Daily Telegraph enigmatologist, Barry R. Clarke, presents over 120 fiendish problems that will test both your ingenuity and persistence. Between these covers are puzzles in geometry, arithmetic, and algebra (there is even a section for computer programmers). And, for the smartest readers who wish to stretch their mind to its limits, a selection of engaging logic and visual lateral puzzles is included. Although no puzzle requires a greater knowledge of mathematics than the high school curriculum, this collection will take you to the edge. But are you equal to the challenge? Features High-school level of mathematics is the only pre-requisite Variety of algebraic, route-drawing, and geometrical conundrums Hints section for the lateral puzzles Warm-up excercises to sharpen the wits Full solutions to every problem Barry R. Clarke has published over 1,500 puzzles in The Daily Telegraph and has contributed enigmas to New Scientist, The Sunday Times, Reader's Digest, The Sunday Telegraph, and Prospect magazine. His book Challenging Logic Puzzles Mensa has sold over 100,000 copies. As well as a PhD in Shakespeare Studies, Barry has a master's degree and academic publications in quantum physics. He is now working on a revised theory of the hydrogen atom. Other skills include mathematics tutor, filmmaker, comedy-sketch writer, cartoonist, computer programmer, and blues guitarist! For more information please visit http: //barryispuzzled.com.