5 minutes to think. The best puzzles of the Soviet era

The book contains interesting experiments from the field of physics, mathematical puzzles, fun and tricks, chess sketches and crosswords. All that you need to solve them is knowledge of the school curriculum, but the main thing is quickshit, logical thinking and curiosity. From the examples and tasks given here, you will see how ridiculous and inconsistent with common sense the conclusions you can come if you reason incorrectly, and, conversely, as logical reasoning, the justice of thought can be proved, which at first glance seems completely ridiculous, and solve insoluble in appearance tasks. And, of course, a little time - five minutes to think in most cases is enough!
The book saw the light in the distant 1950 and for several years was published ordinary at that time and completely fantastic circulations of several hundred thousand copies for today. She is remembered and loved, but even among the most accurate readers the Soviet edition has already collapsed into pieces. We preserved the original text of the book as much as possible. They ruled only the most necessary: ​​physics and geography, for example, went forward, and it would be wrong to mislead readers. Otherwise, they tried not to interfere in the text, retained the style, structure and logic of the Soviet edition. To do this, I had to redesign the text and retire 330 drawings. The tasks and puzzles, made up on the materials of the best scientists of their time, are collected by time and generations of people -educated people. Puzzles and entertaining tasks are the best way to train memory and development of intelligence, in addition, a great opportunity to have a fascinating time