As if the possibility of a regular volcanic eruption wasn't disturbing enough to some readers, it turns out that there is another class of volcano whose destructive power is much more frightening. Known to scientists as a supervolcano, this type of volcano produces at least 240 cubic miles of magma in a single eruption. A recent documentary produced by NOVA looks into the possibility of a recrudescence of such an ancient supervolcano, and attempts to offer a balanced and introspective portrait of these phenomena. Visitors can learn about historic eruptions of this magnitude on the site, and also consider an interactive slide show that provides information about Toba, a supervolcano that flourished on the island of Sumatra 75,000 years ago. Additionally, the site includes a number of tools for educators and a question and answer session with Dr. Drew Shindell, a climatologist at NASA's Goddard Institute for Space Studies.