Marie and Pierre Curie were essential figures in furthering the study of radioactivity. The pair discovered two new elements, which they named polonium and radium, leading to huge breakthroughs in the process of using X-rays. This book provides biographical information about the Curies’ life before and during their studies. Full-color and historical photographs help readers learn the STEM concepts associated with radioactivity, and the ways in which it has been used throughout history.