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Reporter Nick Spitzer spends a week on the Colorado River in the Grand Canyon with former Secretary of the Interior Stewart Udall. Udall talks about the need to preserve the Canyon: past & present. When he was in office he helped block a proposal for two dams that would have covered the Canyon with water. Nowadays the problems are noise and too much tourism. (STEREO)

NPR's Joanne Silberner reports that a new study is questioning the value of a test commonly performed on heart patients. The test, known as 'right heart catherization,' is performed on an estimated one million patients each year, at a cost of more than two Billion dollars. The new study, in the Journal of the American Medical Association, indicates that the test has no value, and may actually harm patients.

NPR's Ann Cooper reports from the United Nations on its growing financial problem. There are three months left in the year and only half the members have paid their dues for 1996. The largest dead-beat is the United States. It owes more than one-point-six billion dollars in overdue bills to the U.N.

NPR's Cheryl Devall reports that on this opening day of the Democratic National Convention, party liberals are generally keeping a low profile. They are focused on getting Clinton re-elected and, more importantly to some, regaining control of the House and Senate. But there are still divisions among Democrats over the party's direction, with Clinton's recent signing of the the welfare bill angering many liberal Democrats.

A sound montage of a few prominent voices in this past eek's news, including Sen. John Breaux (D-LA) on the health care bill; Sen. ohn Warner (R-VA) on the welfare bill; Bob Dole on Hollywood; Olympic bombing uspect Richard Jewell; President Bill Clinton fueding with a reporter, and usic from the Shangri-Las (obit: Marguerite Ganser Dorste).

Republican presidential contender Bob Dole was finishing up a two-day Southern campaign swing today with stops in Louisiana and Tennessee. He continued to promote his tax-cut proposals and criticized the White House for trying to scare voters into believing that he would cut Medicare and Social Security to provide tax breaks. NPR's Elizabeth Arnold reports.

NPR's Richard Harris reports that scientists have re-created the jaw of a Tyrannosaurus rex to determine just how strong the creature's bite was. The researchers found that the T.rex jaw apparently could produce extremely strong forces. The results provide more evidence that the T.rex was a predator, and not a scavenger, as some paleontologists have thought.

Fanueil Hall Marketplace in Boston is a model of urban redevelopment projects...and one of the most popular tourist spots in the Northeast. But it's celebrating its 20th anniversary amidst a din of complaints from merchants, who accuse the developer of charging excessive fees and letting the place appear rundown. Aaron Schachter of member station WBUR reports.

Since January of this year, the computer trade press has run one article after another questioning the basic health of the Internet. Pessimists say the Internet will either experience so-called brownouts or an actual collapse sometime soon. But NPR's John McChesney, who talked with a number of Internet experts for this report -- found that the pessimists are in a small minority.

The Union Pacific Corporation is on its way to becoming the largest railroad in the Western Hemisphere...despite warnings that the $5.4 billion merger with San Francisco-based Southern Pacific harks back to the days when a handful of rail barons ran the railroads. As NPR's Jim Zarroli reports, a federal transportation board approved the merger almost entirely on Union Pacific's terms...and over the protests of three government departments.