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Paul Lioy, professor of Environmental and Occupational Medicine at UMDNJ-Robert Wood Johnson Medical School, and one of the first scientists to take samples from Ground Zero after the destruction of the Twin Towers, shares his personal and professional perspectives on the World Trade Center dust. In Dust: The Inside Story of Its Role in the September 11 Aftermath, he investigates what the material was that rained down after the disintegration of those buildings and answers questions about the environmental effects, public policy initiatives, health outcomes and scientific findings that played a critical role in the aftermath of 9/11.