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For something that happens every year of our lives, we really don't know much about Christmas. We don't know that the date we celebrate was chosen by a madman, or that Christmas, etymologically speaking, means "Go away, Christ." Nor do we know that Christmas was first celebrated in 243 AD on March 28—and only moved to December 25 in 354 AD. We're oblivious to the fact that the advent calendar was actually invented... more...

A geometric dissection is a cutting of a geometric figure (such as a regular polygon, or a star, or a cross) into pieces that we can rearrange to form another geometric figure. The best dissections are beautiful and possess economy (few pieces), symmetry, or hingeability. They are often challenging to discover. Ernest Irving Freese was an architect who lived and worked in Los Angeles until his death in 1957. Shortly before he passed away, he completed... more...

A full-color celebration of stunning visual illusions and the science behind them In Champions of Illusion, Susana Martinez-Conde and Stephen Macknik present a smorgasbord of mystifying images, many selected from their Best Illusion of the Year Contest. Whether it’s false motion, tricks of perspective, or shifting colors, Champions of Illusion is packed with adventures in visual perception. If you have ever found yourself... more...

If you're looking to learn about the game of chess and win? The Everything Chess Basics Book provides you with the perfect introduction. Endorsed by the United States Chess Federation and coauthored by Anne Ashton, Director of Marketing, Advertising, and Outreach for the U.S.C.F. and Peter Kurzdorfer, editor of Chess Life magazine, The Everything Chess Basics Book is an authoritative guide that appeals to chess players of all ages and skill. From... more...


While many think of algorithms as specific to computer science, at its core algorithmic thinking is defined by the use of analytical logic to solve problems. This logic extends far beyond the realm of computer science and into the wide and entertaining world of puzzles. In Algorithmic Puzzles, Anany and Maria Levitin use many classic brainteasers as well as newer examples from job interviews with major corporations to show readers how to apply... more...

Every mathematician (beginner, amateur, and professional alike) thrills to find simple, elegant solutions to seemingly difficult problems. Such happy resolutions are called ``aha! solutions,'' a phrase popularized by mathematics and science writer Martin Gardner. Aha! solutions are surprising, stunning, and scintillating: they reveal the beauty of mathematics. This book is a collection of problems with aha! solutions. The problems are at the level of... more...

A geometric dissection is a cutting of a geometric figure (such as a regular polygon, or a star, or a cross) into pieces that we can rearrange to form another geometric figure. The best dissections are beautiful and possess economy (few pieces), symmetry, or hingeability. They are often challenging to discover. Ernest Irving Freese was an architect who lived and worked in Los Angeles until his death in 1957. Shortly before he passed away, he completed... more...

The book constitutes an elementary course on Plane Euclidean Geometry, pitched at pre-university or at advanced high school level. It is a concise book treating the subject axiomatically, but since it is meant to be a first introduction to the subject, excessive rigour is avoided, making it appealing to a younger audience as well. The aim is to cover the basics of the subject, while keeping the subject lively by means of challenging and interesting... more...

#1 Amazon New Release! Sex roles, sex rules and sexual practices ─ How much do you really know about sex and sexual activity customs and behavior around our world? Sex is always hot. Other people's lusty antics even hotter. This book pulls back the curtains on a dizzying array of hilarious stereotype-busting sexual practices from around the world. It is joyful, deliciously outrageous, titillating, hilarious. The fact that... more...