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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.

NPR's Nina Totenberg finishes her series of reports based on the newly released records of Supreme Court Justice Harry Blackmun, who died five years ago. Some of the thousands of documents trace the relationship of Blackmun and Chief Justice Warren Burger, who grew up together and delighted in serving on the court together. Later, professional conflicts damaged their friendship.

Balloting appeared to go smoothly in Tuesday's four Southern Democratic primaries, despite concerns about new voting machines and the accuracy of vote counts. Election experts say they expect a lot of legal scrutiny of this year's voting procedures. NPR's Pam Fessler reports.

A new study finds that high-intensity treatment with drugs known as statins may help keep heart arteries from getting clogged with cholesterol. The results -- dramatically lower cholesterol levels -- may in turn prevent heart attacks and other heart disease. The study was released Monday by the New England Journal of Medicine. NPR's Richard Knox 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 Liane Hansen chats with singer and songwriter Vienna Teng, who performs songs from her second CD, Warm Strangers. Since their first conversation in 2002 about her debut CD, Teng has toured the country, enjoying a bit of fame and recognition for her talent. She has no regrets about leaving her computer engineering job to pursue music.

Eight months before the U.S. presidential election, likely voters are paying unusually close attention to the contest ahead, and they're polarized in their views, according to the latest NPR poll. The poll finds that if the election were held today, voters would be almost evenly split between President Bush and Sen. John Kerry. NPR's Mara Liasson reports.

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.

Vijay Iyer and Mike Ladd created a new CD that weaves together interviews with people in airports around the world with jazz and hip hop music. NPR's Michele Norris talks with Iyer and Ladd.

With his win in Tuesday's Illinois primary, Sen. John Kerry officially secures the Democratic presidential nomination. He now faces the tough task of defining himself clearly to voters, as attack ads from President Bush's re-election campaign portray Kerry as weak on national defense. Hear NPR's David Welna.