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Search for Columbia Debris Widens

More space shuttle Columbia fragments and human remains are discovered Monday, yet little new information is learned about the cause of Saturday's disaster. Meanwhile, critics express concern over whether NASA's budget cuts and use of contractors may have compromised safety. Hear reports from NPR's Richard Harris, NPR's Howard Berkes and NPR's Chris Joyce.

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Howard Berkes is a correspondent for the NPR Investigations Unit.
Award-winning journalist Richard Harris has reported on a wide range of topics in science, medicine and the environment since he joined NPR in 1986. In early 2014, his focus shifted from an emphasis on climate change and the environment to biomedical research.