In this children's science book from the early 1960s, the concept of atoms and the science behind them is introduced. The book recounts the history of scientific discoveries related to atoms, radioactivity, and nuclear energy. The author promotes the benefits of atomic power plants and nuclear energy while also exploring other positive uses of radioisotopes. The book pointedly does not discuss the history of nuclear weapons and how the scientific discoveries related to atoms led to the ability to create those weapons. - Summary by Elsie Selwyn