"Radioactive Substances" is a scientific book written by Nobel Laureate Marie Curie. In this work, the author investigates the properties of radioactive substances and their impact on nature and human health. The book is the result of deep scientific research and offers the reader a detailed overview of how radioactivity affects our lives. Marie Curie reveals the secrets of radioactivity in an accessible form, making this complex scientific topic understandable to the general public. "Radioactive substances" became a source of important knowledge for scientists and opened the door to new discoveries in the field of radiation.