The heart is the engine and the metronome of life. As long as it functions properly, we don’t give it much thought. However, as soon as disturbances occur, when the heart falls out of rhythm or becomes weak, pressing questions arise: Is heart palpitations harmless or dangerous? How does atrial fibrillation manifest? Do rheumatic diseases damage the heart? Does stress pose a risk to the heart? Are sensors and apps for heart monitoring recommended? How can one recognize a heart attack? These and 95 other questions are answered concretely and understandably by Prof. Dr. med. Thomas Meinertz, one of Germany's leading heart specialists and chairman of the German Heart Foundation, in this book. Among them are also fundamental questions, such as "How does our heart work?" or seemingly playful ones like "Can the heart break?" or "Do women's hearts beat differently?".