From the development of radio to the cloning of Dolly the sheep, science has influenced many of the most important events of the twentieth century. Understanding 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 the social, cultural, and political events of the last one hundred years. Ideal for students, this resource will also assist teachers integrate science and social studies topics into the school curriculum.