Crystals of smashed cement, the perfect size for lodging in lungs,
made up most of the dust rising from the World Trade Center.
When ten million of tons of building, mixed with 91,000 liters of jet fuel, collapse into a smoking heap, an incredible variety of pulverized materials rise into the air. Though no one took samples of the plume that rose up from the World Trade Center on 9/11, samples of the dust that filtered down in the following days and gas emanating from the pile have given a
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