Don't know what to do in your free time? Or maybe you don't mind raising your intellectual level? Then go! In this book you will find many entertaining puzzles, puzzles and riddles. But that's not all! There is also a cheerful company for solving them - the family of a unique person with the outstanding abilities of J. M. Perelman. Members of this friendly family constantly make such a kind of "exercise for the mind." And they also show tricks. Yes, yes, the real tricks are scientific and not quite... Join them and you, because the ability to find non-obvious answers to seemingly easy questions, the ability to surprise others with a simple but effective focus will raise your authority among peers and make you the soul of any company.