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What is a tangram? It is more easily seen and understood than defined in words. But to put it briefly, it is a geometric dissection puzzle in which seven standard pieces (five triangles, one square, one rhomboid) are used to make images of various objects. The origin of the name is not known, but the game itself is of Chinese origin, and for centuries it has been one of the most popular diversions in the Orient.
The tangram is not entirely new to America, since Yankee sea captains brought books of tangram puzzles back from Canton and Shanghai. Edgar Allan Poe was a devotee, while on the...

Delete Me: An Argument Against Facebook details how Facebook users are lured into using the network and then decieved into sharing large amounts of information about themselves and their contacts. This collection process raises a number of questions such as how did Facebook get here, what role does it play in government, and where is it headed? The text sets out to answer these questions and more for readers who may be interested in understanding what Facebook really is. When the reader is finished they will understand that Facebook is part of a much larger conspiracy to know everything about...

With over 10,000 diagrams and extensive tables of properties, this atlas is comprehensive and unique. Never before has so much visual information about graphs been collected in a single volume, making it an invaluable source for researchers in graph theory, operations research and computer science.