Not all microbes are harmful. Petka is actually useful. Without people like him, we wouldn't have sour cream or kefir. There are so many microbes in one drop of water that you can't count them. You need a microscope to see these little ones. But maybe they are also looking at us - from the other side of the magnifying glass?

Get ready to laugh out loud, because this book contains the best harmful advice about school, friends and parents, and also about girls and boys! Uncle Kolya Vorontsov tried and drew very funny illustrations for each piece of advice. All you have to do is read carefully and look at the pictures!

Georgy Alekseevich's stories about his native nature are so interesting and colorful that several cartoons ‘Forest Travelers’ (1951) and ‘In the Forest Thicket’ (1954) (co-authored with Vera Chaplina) were made based on them.