More than three million visitors step onto this charged volcanic landscape every year. Yet the geologists that monitor it are unconcerned about a large, imminent eruption. Find out why.

The magma chamber responsible for Yellowstone's volcanic activity is buried 8km beneath the surface. Find out how researchers monitor its geologic moves.

Meet Professor Robert B. Smith, who has spent nearly his entire 40-year scientific career studying the volcanic setting of Yellowstone National Park and geologic evolution of the Teton Range.

Find out why this huge shoal between Massachusetts' Cape Cod and Nova Scotia's Cape Sable Island is one of the world's most important fishing resources — and why it's now at risk.

Water bodies on our planet form a network, which aquatic species migrate over evolutionary time as needed or by accident. Find out how Homo sapiens have dramatically changed and accelerated this process.

Meet a deep-sea ecologist at the Monterey Bay Aquarium Research Institute who has pioneered the use of submersible robots to study jellyfish and other gelatinous invertebrates in their native deep-sea environment.

Meet "Big Red," a new species of jellyfish that is bulbous, dusky red, and huge, nearly one meter (about three feet) in diameter, with several fleshy arms instead of tentacles, like a balloon with greedy fingers.

Learn more about these forests, once generally dismissed as swampy wastelands but now valued as remarkably diverse and important ecosystems.

Investigate this remarkably tough plant that can live in water up to 100 times saltier than most other plants can tolerate, not to mention thrive despite twice-daily flooding by ocean tides.

In a handful of cases, humans have contracted H5N1 from birds and then passed the virus to other humans. Even so, doctors and scientists are taking great pains to prepare for the possibility of such a pandemic.