As with the first edition, this second edition of Living in a Microbial World is written for students taking a general microbiology course, or a microbiology-based course for non-science majors. The conversational style and use of practical, everyday examples make the essential concepts of microbiology accessible to a wide audience. While using this approach, the text maintains scientific rigor with clear explanations spanning the breadth of microbiology, including health, evolution, ecology, food production, biotechnology, and industrial processes. Each chapter contains a series of case studies based on microbiology in the news, in history, and in literature. There are questions at the end of each case study and the end of each chapter, as well as an online quiz with help on answering the questions. The text, questions, and cases have been updated to reflect the changing influence of microbiology in the world today, from the microbiome, to new disease outbreaks (Ebola and Zika) and antibiotic resistance, to new biotechnology tools (CRISPR-Cas).