"Harry Potter and the Methods of Rationality" is an alternative version of the popular series about the young wizard Harry Potter. In this book, Harry Potter decides to take a rational approach to the study of magic, which changes the course of events in the Great Wizarding World. Different from the original series, this novel encourages the reader to consider how things might be different if Harry shared his decisions based on logic and scientific principles. Will Harry be able to change the wizarding world? This book will interest all fans of the "Harry Potter" series and not only, because it gives new perspectives on the well-known story.