In this book, microbiologist and writer Suzanne Thiele talks about what microorganisms surround us in everyday, familiar and - seemingly - almost sterile conditions. You will learn about who microbes are, where they come from, which of them are friendly to humans, and which ones cause us harm. Together with the author, you will take an unusual tour of the apartment: the hallway, kitchen, bathroom, living room and children's room are inhabited by countless microorganisms, the influence of which on our lives is enormous and not always positive. The author talks about scientific research easily and with humor. At the end of each chapter you will find useful tips and rules to make your life safe and comfortable.