From the development of radio to the cloning of Dolly the sheep, science influenced many of the most important events of the twentieth century. Understanding the science is essential to understanding this history--but where to get started? This handy reference source provides students, parents, and teachers with the tools needed to understand how the concepts and principles from biology, chemistry, physics, and earth science affected social, cultural, and political events of the last one hundred years. Ideal for students preparing research papers in either science or social studies classes, this resource will also assist teachers integrate science and social studies topics into the school curriculum.