Twenty-three years later, over 1,000 families are still waiting for news of loved ones lost in the World Trade Center attacks on 9/11. Correspondent Scott Pelley looks at how efforts to search for and identify their remains have never stopped, driven by the promise made by the New York City Office of Chief Medical Examiner. Pelley visits their laboratory, which is using new advancements in DNA research and breakthrough techniques to provide answers for families holding on to hope. This is a double-length segment.

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