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Commentator Ruth Levy Guyer, a biologist, ponders the uncertainties inherent in some professions, and the kinds of minds that appreciate those uncertainties.

The great fear of many experts is that Hurricane Katrina may drive the waters of Lake Pontchartrain over levees and into the city, overwhelming an elaborate pumping system. The potential exists for the worst flood damage in U.S. history.

Jacob McMurray is senior curator at the Science Fiction Museum and Hall of Fame in Seattle... and at the Experience Music Project, a music museum. His reading list is heavy on sci-fi, with a bit of rock history, too.

With the Israeli withdrawal from Gaza complete, attention turns to plans for redevelopment in the area. Nigel Roberts of the World Bank tells Renee Montagne about rebuilding prospects and obstacles to economic recovery.

The Base Closure and Realignment Commission overturns the Pentagon's recommendation to close Ellsworth Air Force Base in South Dakota. The decision preserves the state's second-largest employer.

The commentator recalls his childhood battles with musical instruments. Regardless of whether it was wind, brass, piano or percussion, practice did not make perfect.

Hundreds of women are taking part in a revival of one of America's most violent sports: roller derby. Alex Cohen of NPR station KQED, and a member of the L.A. Derby Dolls league, reports.

"I'm asking for justice," says Peter Lyoya, whose son Patrick Lyoya, 26, was fatally shot by Grand Rapids police officer, Christopher Schurr, 31, during a traffic stop last month.

Iran holds a runoff presidential election Friday. Voters will choose between Akbar Hashemi Rafsanjani, a former president who is casting himself as a reformer, and Mahmoud Ahmadinejad, the younger, hard-line mayor of Tehran.

A group of dedicated computer wizards are fighting back against Internet scams that promise millions of dollars. Calling themselves "scambaiters," they have collected enough information on the scammers' tools and techniques that even the FBI has taken notice.