Shuttle Columbia Investigation
Investigators continue to gather clues that might help explain what went wrong when the space shuttle Columbia broke up Saturday morning, killing all seven crewmembers. Today's memorial service with President Bush will offer NASA officials rare pause in an otherwise tedious examination of flight videos, computer data, and debris. NPR's Richard Harris reports that while NASA is making strides in piecing the accident together, officials say they're far from any conclusions about what caused the disaster.
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