Themes are intended to provide in-depth coverage of certain topics, using selected items in the World Digital Library. These sections provide historical and cultural context and explain the connections between books, manuscripts, maps, and other documents that may be from different places and time periods but that all relate to a single topic. Themes are intended for use in schools and by the general public. Arabic and Islamic Science and Its Influence on the Western Scientific Tradition illuminates the achievements of the Arab and Islamic world in four areas -- mathematics, astronomy, medicine, and technology – and discusses the influence on the Western scientific tradition of Arabic and Islamic achievements in these fields. The narrative of this section was written by Dr. George Saliba, Professor of Arabic and Islamic Science, Department of Middle East and Asian Languages and Cultures, Columbia University, New York, while he was a Distinguished Visiting Scholar at the Kluge Center, Library of Congress. The items used to illustrate the narrative were contributed by WDL partners and were chosen by the WDL staff at the Library of Congress. Development of this section was made possible by the financial support of the Qatar National Library.