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Bacteria are our best friends and our worst enemies. In this book, we will tell you which of these invisible to the eye microorganisms can cause serious harm to health and which can be beneficial. You'll learn how to protect yourself from aggressor microbes and how to win over your microbial allies.

Vivid illustrations on the pages of the publication will allow you to see the invisible world of the oldest inhabitants of our planet. The book is addressed to curious teenagers and their caring parents.