NOVA follows a team of volcano sleuths as they embark on a worldwide hunt for an elusive volcanic mega-eruption that plunged medieval Earth into a deep freeze. They look for the signature of a volcanic eruption big enough to have blasted a huge cloud of ash and sulfuric acid into the atmosphere, which chilled the entire planet. Across the globe, it turned summer into winter.
Watch as birds solve puzzles and challenge our basic notions of intelligence.
Scientists uncover geologic evidence of epic floods that tore through ancient landscapes.
Experts reconstruct the Great Hurricane of 1780 to help predict the risk of future storms.
