Book excerpt: Epistemology is the philosophical study of knowledge. Epistemologists seek to understand knowledge’s nature and availability. What is knowledge? There are competing theories. Can we really have knowledge? Challenges abound. In this lively book, Stephen Hetherington introduces us to epistemological theorizing. He builds a theory and tests it, refines it, and challenges it again. He explores such topics as evidence, truth and belief, different kinds of knowledge, and knowledge’s value, as well as sceptical views concerning knowledge of the physical world, one’s own mind and memory, and rational limits for observation and reason. This epistemological theorizing is then applied to some of life’s most pressing issues, such as how to live and how to understand ourselves and others. What is Epistemology? is a practical and student-friendly guide to one of the most dynamic areas of philosophy. It will be the go-to introductory epistemology text.