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CDC also distributed more than two million health alert notices to travelers entering the United States from China , Hong Kong , Singapore , Taiwan , Vietnam , or Toronto . In 1980 General Motors sponsored a symposium in Warren , Michigan , titled " Particulate Carbon : Atmospheric Life Cycle , " during which Novakov delivered an address on soot in the atmosphere . In Dr. Robert McCarthy 's American Civilization class at the Key School in Annapolis , MD , students are asked to role-play leading figures in Supreme Court cases , including the plaintiff and defendant , lawyers , and the nine Supreme Court justices . Thanks to Gutenberg , the monks lost their control over the distribution of text , and it has of course been suggested that one of the impacts of the Internet et al will be to remove librarians and publishers from their present ` gatekeeper ' roles in the information chain . " Was it a child in Vietnam , chained to a sewing machine without food or water ? This Emperor , Wudi , ruled China during the Han Dynasty from 141-86 BCE .