"This moves us a lot closer to saying that the foam can do this kind of damage," said Hubbard, a member of the Columbia Accident Investigation Board.
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"I think this moves us a lot closer toward saying that foam can do this kind of damage," Hubbard said.
He arrives later this week on the first state visit by a US President.
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Mr Bush arrives on Tuesday on the first state visit by an American President.
Its legal representatives began meeting with plaintiffs' attorneys last week to discuss a settlement.
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Attorneys for both the archdiocese and the plaintiffs began meeting last week to reach the out-of-court settlement.
Bradley Manning acquitted of aiding the enemy
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Wikileaks soldier Bradley Manning acquitted of aiding the enemy