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Wooden remains of two Roman wells - one of which had collapsed before it could even be used - have revealed what archaeologists have described as "a failure of Roman engineering on an industrial scale". The discovery came during roadworks on the A428 between the Caxton Gibbet and Black Cat roundabouts in Cambridgeshire. Natalie Malcolm hears what the finds can tell us about problem solving 2000 years ago. (Photo credit: Museum of London Archaeology)