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That old black magic Can lucky numbers, colours or shapes help construction projects?

Thirteen was certainly an unlucky number for Denmark's resund crossing two weeks ago. On 4 August a failed bulkhead caused the 13th section of the immersed tube tunnel to sink prematurely and land on the sea bed 3m out of position. Moving the 57,000t concrete unit into place is likely to delay the project by as much as six weeks.

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