-there's that issue of the falling foam during the launch of space shuttle columbia. -very early on nasa told us that they knew about a foam -- a debris event. but we didn't even know enough about the shuttle to understand that there was foam on the tanks. the press wants to know what happened and it's like, "yep, so do we." -it's a mammoth job for those taking part in a mammoth task. -covering many hundreds of square miles. -it's the largest recovery effort that has ever been attempted in this country. -as an investigator, i wanted as ironclad a case as we could possibly have for the sequence of events leading to the cause of the crash of space shuttle columbia. but if we were going to do that, we needed to collect all the debris and reconstruct the shuttle. -1,200 sites have been identified.

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