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Did global warming play a part in the recent floods, or is it the extreme end of the natural cycle? Maggie Philbin investigates the threat of storm surge.
The team look at flu and its different strains. Jem Stansfield explains the disease on a cellular level, while Liz Bonnin witnesses the manufacture of vaccines.
The team look at the many measures engineers are taking to ensure Britain's ageing rail system stays on track.