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Sept. 11, 2001

Photo detail

In this Sept. 13, 2001 photo, a first responder works in the rubble of the former World Trade Center in New York. A decades worth of study has answered only a handful of questions about the hundreds of health conditions believed to be related to the tons of gray dust that fell on the city when the trade center collapsed, from post-traumatic stress disorder, asthma and respiratory illness to vitamin deficiencies, strange rashes and cancer.

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