American Airlines, the world's largest carrier, cancelled 850 additional flights on Wednesday after cancelling nearly 500 on Tuesday in order to reinspect and possibly rework the wiring of its widely-used MD-80 fleet.

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Inspectors in China reported the discovery of more tainted products on Tuesday. A food safety advocate and an investment bank executive explain what's behind the problems.

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Author Mary Graham discusses her new book, "Full Disclosure: The Perils and Promise of Transparency," on the government's ability and challenges to providing vital information to the public.

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The Food and Drug Administration issued a preliminary decision Thursday saying that food products from cloned animals are safe to eat. Under the proposed guidelines, the products would also not be required to carry a special label.

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In an attempt to increase security after 9/11, the U.S. Coast Guard has conducted over two dozen live-fire drills using their new deck-mounted machine guns in the Great Lakes region. A reporter discusses the public's reaction to this new program.

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The U.S. Chemical Safety and Hazard Investigation Board said British Petroleum's cost-cutting at its Texas refinery led to a fatal explosion in March 2005. The head of the board discusses the findings.

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Advertisers and employers are moving to take advantage of social networking Web sites, such as MySpace and Facebook, as the sites draw hefty numbers of users. Judy Woodruff reports on the phenomenon in the first part of a series on…

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