This book has been claimed as "The most popular Russian puzzle book ever published." The puzzles were written/compiled by Boris Kordemsky, who filled his book with sneaky, clever, and mind boggling puzzles.

No advanced mathematics is required, but those who can see unique and clever ways of putting their knowledge to use will do well with these puzzles.

Howard Eves' textbook on the history of mathematics is well respected and regarded around the world. It contains not just the broad overview of mathematical history, but also some of the personal stories in the lives of mathematicians - some of which are quite amusing!

For example, opening the text at random I discover the story of Lejeune Dirichlet (of the Dirichlet Principle) forgetting to tell his father in law of the birth of his first child. The father in law, upon learning of the child's birth, commented that Dirichlet "should have at least been able to write 2 + 1 = 3." These personal stories break up the more "scholarly" information, and keep the reader always aware that these were real people with real stories, not just old black-and-white photographs in a textbook.

If you are a mathematics teacher (particularly at the high school level) keep a copy of this book on hand - it will provide you not just with history, but with interesting anecdotes which will help keep your classes a little more...alive!

Cranks, gears, and levers are just the beginning of the machine components you can use to build Rube Goldberg machines in this crazy piece of software. Beyond the basics you have such silly components as robots, cannons, blimps, plants, balls, and much more.

Each level has a task to complete, and a specific set of components required to complete the task. The user interface is very simple, and whether or not you solve the puzzle on your first try, you'll have great fun watching your machine in action.

The software is built on a real-physics engine, which simulates gravity, air pressure, and electricity.