"Computing the electrical activity in the heart" is a specialized book that explores the complex functioning of the heart and the electrical activity that governs it. The heart is a remarkable organ that beats approximately 2.5 billion times over a normal lifespan, pumping an enormous amount of blood through a vast network of blood vessels. Despite centuries of research, many unresolved questions about the heart's functioning continue to intrigue scientists worldwide. This book provides a comprehensive overview of advancements in research on the heart's electrical activity, including the analysis of individual cardiac muscle cells and the mechanisms that regulate blood flow through the heart. The historical development of bioelectricity and advancements in electrocardiography are also discussed, making the book a valuable resource for students and professionals in the fields of cardiology and biomedicine.