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NOVA scienceNOW: AsteroidWill a doomsday rock the size of the Rose Bowl hit Earth in 2036?
Avalanche!Scientists take you inside a snow slide to unlock its deadly secrets.
Arctic PassageRelive two legendary expeditions—one tragic, one triumphant—to pioneer a route through the Northwest Passage.
Building on Ground ZeroCan lessons learned from the Twin Towers' collapse make new buildings safer?
Crash of Flight 111One of the most exhaustive investigations in aviation history reveals telling clues to the cause of a disaster off Nova Scotia.
Deadliest Plane Crash, TheNOVA investigates the worst aviation accident of all time.
Deadly Shadow of VesuviusThe shattered remnants of the Roman city of Pompeii bear witness to the risk that the people of Naples still face today.
Descent Into the IceA team of "glacionauts" ventures into a labyrinth of unexplored and hazardous glacier caves on France's Mt. Blanc.
Fire WarsWildland firefighters battle one of the most destructive fire seasons in U.S. history.
Flood!The Great Flood of 1993 leaves a wake of destruction across the Midwest. Can rivers ever be contained?
Hunt for the SupertwisterTornado-chasing scientists with an eye to better forecasting risk their lives to plumb the secrets of nature's most terrifying killer.
NOVA scienceNOW: HurricanesPredicting a hurricane's intensity is notoriously difficult, but new tools may make it easier.
NOVA scienceNOW: Mass ExtinctionWhat caused the mother of all extinctions 250 million years ago?
Mystery of the MegafloodWhat unleashed a catastrophic flood that scarred thousands of square miles in the American Northwest?
Mystery of the MegavolcanoResearchers from Indonesia to Greenland unearth clues to the greatest volcanic eruption of the last 100,000 years.
Sinking the SupershipThe tragic WWII story of the Yamato, the largest battleship ever built.
Storm That Drowned a CityExperts and eyewitnesses reconstruct the devastating floods that Hurricane Katrina unleashed on New Orleans.
Supersonic DreamEngineers, pilots, and others who knew Concorde tell its remarkable story.
The Spy FactoryExamine the high-tech eavesdropping carried out by the National Security Agency and the pitfalls of surveillance in an age of terrorism.
Tracking El NiñoScientists struggle to understand the El Niño phenomenon, second only to the seasons in its effect on global weather.
Volcano's Deadly WarningA man obsessed with understanding volcanoes comes up with a radical new way to predict eruptions.
Volcano Under the CityA restless mountain threatens a bustling metropolis perched on its flanks.
Wave That Shook the WorldExperts reconstruct the 2004 Indian Ocean tsunami in an effort to prepare for the next big one.
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