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The Environmental Protection Agency proposes that 11 of the nation's worst toxic waste sites should get cleanup priority under its Superfund initiative. The list, meant to relieve the worst contamination levels, includes projects in nine states. NPR's John Nielsen reports.

The two rovers on Mars continue their pursuit of evidence that water once flowed on the Red Planet. Earlier this week, scientists said the rocks and soil at Opportunity's landing site did show signs of having been shaped by flowing water. NPR's Joe Palca and NPR's John Ydstie discuss the findings.

The Hubble Space Telescope provides astronomers with what they believe to be the edge of the Big Bang. Space Telescope Science Institute officials say the deep-space view was derived from focusing the telescope on a single point for 1 million seconds. The resulting image is being termed the Ultra Deep Field. NPR's David Kestenbaum reports.

Commentator Walter Cronkite marks the 50th anniversary of a watershed event in television news. In 1954, Edward R. Murrow's See It Now series took on the tactics of Wisconsin Sen. Joseph McCarthy, who accused many in government and media of being Communist dupes. Cronkite says the pioneering broadcast by Murrow and his producer, Fred Friendly, helped pierce the bubble of McCarthy's demagoguery.

NPR's Nina Totenberg continues her series on the papers of former Supreme Court Justice Harry Blackmun, who died in 1999. The archives reveal the justices acting with extreme care in writing about school prayer -- to the point of gleaning opinions about opinions.

Sen. John Kerry takes another step toward clinching the Democratic presidential nomination Tuesday with victories in Southern states. Kerry, who no longer faces substantial competition in his bid to oppose President George Bush, had campaigned heavily in Florida, a likely November battleground. Hear NPR's David Welna.

Iraqi negotiators work toward signing a revised interim constitution, with hopes of a ceremony Monday. Last week, just as the constitution was about to be signed, a number of Shiites on Iraq's Governing Council objected to some of the language in the document. Hear NPR's Liane Hansen and NPR's Ivan Watson.

The latest Pew Research Center poll, "A Year After the Iraq War," finds rising levels of mistrust and discontent with the United States and its policies. Those negative findings were prevalent in both Europe and the Arab world. The poll, conducted in Britain, France, Germany and Russia, also included Pakistan, Morocco, Jordan and Turkey. Hear NPR's Robert Siegel and Pew director Andrew Kohut.

Spanish police detain an Algerian in connection with last week's deadly terrorist bombings in Madrid. Police believe they have identified five Moroccans who took part in the attacks, but say other foreigners may have been involved. Officials are still investigating a possible link to al Qaeda. NPR's Sylvia Poggioli reports. Hear NPR's Michele Norris and professor Jessica Stern.

On Susan Werner's newest CD, her sixth, the singer-songwriter moves distinctively away from folk and toward the jazzy American songbook style recently embraced by artists such as Rod Stewart and Norah Jones. NPR's Susan Stamberg reports. Hear three selections from Werner's I Can't Be New.