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May 7, 2010 6:57 AM

'Dome' is a temporary method of containing gulf oil spill

The 78-ton steel containment dome that crews lowered over the Deepwater Horizon site on Thursday night represents the best immediate chance to slow the oil spilling into the Gulf of Mexico from the blown-out well. But even if it works — a big "if" that may not play out for days — it's still a temporary measure subject to weather and other conditions.

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