Of Course The Greatest Collection of Riddles and Brainteasers For Expanding Your Mind by Zack Guidois a challenging book on classic riddles and brainteasers which will cause you to think carefully abou fundamental questions of common sense, design and functionality. The questions involve lproblems logically while "thinking outside the box" at times.

One of the author's best brainteasers is the Redmond Question. The question asks why manhole covers are round. All sorts of solutions can be presented to resolve this question. Here are a few examples. For instance, a manhole cover is round because it covers the hole without having to position the cover in any particular way. A physical scientist might say that the manhole cover is round because that shape tolerates random stresses from the earth. Also, metal expands in summer so that the expansion is more uniform and less exaggerated.

An engineering designer would indicate that it's easier to pour hot mold onto a circular shapethan a round one. In addition, the load is equally distributed so that individual stress points are handled easily. Another common sense answer is that a round manhole cover can be rolled instead of physically lifted.

Of Course The Greatest Collection of Riddles and Brainteasers For Expanding Your Mind by Zack Guido is the perfect conversation piece at a party or gathering of friends. The questions elicit logical and even some illogical arguments in favor of one point of view oranother. This book could cause hours of endless debate while sharpening skills toview things spatially instead of just linearly. The presentation is easy to understand and participants will go away with an entertaining and rewarding experience.

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