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Noah Adams notes that astronomers have discovered a grouping of galaxies and quasars they say make up the largest "structure" in the universe, measuring more than 600-thousand light years across.

Noah talks with David Brooks, Senior Editor at the Weekly Standard about Linda Chavez's withdrawal from consideration for Secretary of Labor.

The new policy follows up on the tech giant's August announcement that it would take a number of steps aiming to protect minors' privacy. It is intended for cases in which the subject is under 18.

NPR's Nina Totenberg reports on today's Supreme Court decision limiting the scope of the federal Clean Water Act. The court split along its familiar ideological lines, 5-4, in ruling that the Army Corps of Engineers can't use the law to forbid the building of a landfill in a migratory bird habitat. The area, near Chicago, contains abandoned gravel pits that flood with water and attract birds for nesting and breeding. The court majority ruled that Congress intended the Clean Water Act to apply to large or navigable bodies of water.

NPR's Elizabeth Arnold reports that recent comments by Forest Service chief Mike Dombeck about protecting old growth forests were misinterpreted by some news organizations. The inaccurate reports have stirred up some people in the industry and government.

NPR's Jon Hamilton reports on new recommendations out today regarding vitamin A, iron and other nutrients. The guidelines come from the Institute of Medicine, which is for the first time putting upper limits on how much vitamin A people should consume. Excessive amounts of vitamin A, either through diet or through supplements, may cause liver disease and birth defects. The institute issued new advice about consuming vegetables containing vitamin A and other nutrients.

NPR's Brenda Wilson reports on 11-year-old Nkosi Johnson, South Africa's youngest AIDS activist. At last summer's International AIDS conference, Nkosi made a moving speech, a plea really, for acceptance of people with AIDS. Now, he's in a coma, dying of the disease. But his courage and activism have left a mark on the country.

A meeting at NATO headquarters today revealed a disagreement in the alliance over the use of ammunition coated with depleted uranium. Italy contends that the weaponry might be responsible for at least six soldiers who died of leukemia after serving in the Balkans where uranium-tipped anti-tank shells were used. Italy and several other countries argued for a moratorium on the use of such munitions. But Britain and the U.S. say there's no evidence the shells caused the leukemia. Noah talks with Andrew Osborn, European Correspondent for The Guardian, who is in Brussels, Belgium.

NPR's Snigdha Prakash reports that AOL and Time-Warner completed their merger today shortly after the FCC gave its conditional approval. The deal combines the nation's largest internet service provider with the second largest cable operator. It is valued at more than one-hundred-billion dollars. In a prepared statement, the newly merged company said its "scale, scope and reach" would enable it to capitalize on the digital revolution. Analysts say declining ad revenues may hurt the new company in the short run, but were mostly upbeat about its long-run chances.

Later this month and new online service called Questia will debut. It will provide a library containing 50,000 volumes of literature, scholarly journals and texts. The company hopes to eventually reach 250,000 volumes in the next three years. Questia is targeted mostly to students and will allow them to cross-reference, footnote and do a bibliography all online. Robert talks with Troy Williams, the CEO and President of Questia Media, about the new company and what it has taken to get started.