Nova is a popular science television series from the U.S. produced by WGBH Boston. It can be seen on the Public Broadcasting Service (PBS) in the United States, and in more than 100 other countries. It has also won a variety of major television awards, most of them many times over. Nova often includes interviews with scientists directly involved in the subject, and occasionally footage from the actual moment of a particular discovery. Some episodes have focused on historical aspects of science. Examples of topics include Colditz Castle, Drake equation, elementary particles, 1980 eruption of Mount St. Helens, Fermat's last theorem, global warming, moissanite, Project Jennifer, storm chasing, Unterseeboot 869, and Vinland.