"How to Live: Rules for Healthful Living Based on Modern Science" by Fisher and Fisk is a scientific publication written in the early 20th century. This work serves as a comprehensive guide on individual hygiene and healthful living, drawing upon advancements in modern science to promote physical well-being and longevity. The book aims not only to prolong life but to enhance its quality, advocating for a holistic approach to health that includes diet, exercise, and environmental factors. The opening of the book introduces the mission of the Life Extension Institute, which emphasizes the importance of health awareness and disease prevention. Authors Irving Fisher and Eugene Lyman Fisk outline their commitment to disseminating knowledge about individual hygiene as a critical component of overall health. They highlight a cultural shift from viewing health merely as the absence of illness toward embracing a proactive approach that enhances vitality and physical efficiency. The introductory sections emphasize the positive implications of health choices and lay the groundwork for subsequent discussions on essential topics like air quality, nutrition, and lifestyle practices that contribute to a longer, more fulfilling life. (This is an automatically generated summary.)