Ground Zero DNA
Running time 1 minute 33 seconds
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DNA typing has made it possible to identify more than half the people lost at the World Trade Center, and new typing techniques offer the hope that more victims may still be identified.
Credits Transcript
World Trade Center Award
Leslie Robertson, the World Trade Center's structural engineer, receives a prize for innovation in construction technology.
Deconstructing the Towers' Collapse
Running time 1 minute 23 seconds
Did damaged fire protection contribute to the World Trade Center's collapse?
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