Many children and adults know the funny stories of Sergei Georgiev from the plots of the film magazine “Yeralash”. The book contains funny and useful stories: their heroes will discover a waterfall unknown to science, translate the mysterious word “karu-shiga” into Russian, and build the world’s most reliable diving suit at home. There are many stories about sports: hockey, basketball, football... But not only physical education victories and defeats await the boys: there are real discoveries and insights that can be interesting for both children and adults. In addition, the author is a great inventor, he shows how you can solve real, complex problems from adult life - and sometimes writes piercingly and soulfully, revealing himself as a subtle lyricist.