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Investigation

NASA engineers are pursuing competing theories about what may have caused the catastrophic breakup of the space shuttle Columbia. NPR's Larry Abramson reports on how forensic investigators keep a constantly open mind until the evidence for one theory becomes so strong that it leaves no room for doubt.

Copyright 2003 NPR

Larry Abramson is NPR's National Security Correspondent. He covers the Pentagon, as well as issues relating to the thousands of vets returning home from the wars in Afghanistan and Iraq.

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