The government investigation is only partly complete, but it has now looked in detail at one dramatic failure, the breach of a wall that held back water in the 17th Street canal.

NPR: Panel's Report Assigns No Blame in Levee Failures

Just as important, the attacks on Mr Rubin unnecessarily widen a breach with Wall Street.

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In the wake of the attack, the fear was that a breach in the wall, and flooding of the bathtub, might flood the Path tunnels that passed into the bathtub.

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Being aware of social engineering is important, of course, because it can be the precursor for a sophisticated attack meant to breach the wall of your organization.

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Each effort was like a stone added to a wall that looked increasingly impossible to breach.

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