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Liz visits the volcano that brought Britain to a standstill, while Dallas visits Vegas to explain why people are bad at predicting probabilities.
Dallas looks at the origins of weather and explains how the emergence of seasons allowed life to form, with the help of a grenade launcher.
Jem is challenged to build a boat made out of ice, and take it and the rest of the team for a spin in one of the UK's busiest stretches of water.