Science: Diggers

Many an archaeologist has eyed a handsome modern structure and secretly thought of what treasures he might find beneath it, if only somebody would blow it up. The German blitz on London in World War II provided just such an archaeologist's windfall, exposing ancient ruins sealed fof centuries by the close-built modern city. Last week Director William Grimes of the London Museum described the discovery of two blockhouses which the Romans built either to protect Londinium, or to protect themselves from Londinium's people.

Five years ago Grimes got interested in a kink in London's...

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