Marie Curie's groundbreaking book, 'Radio-Active Substances', delves into the mysterious world of radioactivity with meticulous detail. Published in 1904, this book not only presents Curie's meticulous research but also serves as a pivotal moment in scientific history, as it marks the discovery of radium and polonium. Curie's writing style is clear and precise, making complex scientific concepts accessible to readers of all backgrounds. The book provides a comprehensive overview of the properties and behaviors of radio-active substances, laying the foundation for further scientific exploration in the field. Curie's work also sheds light on the ethical implications of harnessing radioactive materials. Overall, 'Radio-Active Substances' is a significant contribution to the scientific community and remains a seminal text in the study of radioactivity. Marie Curie's dedication to scientific discovery and her pioneering research in the field of radioactivity make her a revered figure in the history of science. Her persistent efforts and groundbreaking discoveries have paved the way for countless advancements in the field of chemistry and physics. 'Radio-Active Substances' stands as a testament to Curie's brilliance and serves as essential reading for anyone interested in the history of science or the study of radioactivity.