Influenza, HIV, Ebola - we used to think that viruses only pose a threat to us. But in fact, most viruses are harmless; moreover, they are our indispensable helpers. Viruses are everywhere: in the air, in plants and animals, inside ourselves and even on our skin. They fight bacteria, affect the weather, our well-being and mood, and can contribute to or treat obesity. Viruses are part of our genome! They helped us become who we are. Renowned virologist Karin Mölling describes the incredible and little-known world of viruses. From the book, you will learn about the past of viruses, how they helped people evolve, and how we can use them in the future.