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Robert talks to David Macaulay, host of the five-part PBS Television Series "Building Big," and author of the book of the same name, about the secrets of constructing huge structures. Macaulay describes some of the equipment, and techniques used to erect dams, skyscrapers, tunnels and giant domes. (8:00) On the Web, see /www.pbs.org/wgbh/buildingbig. The book, "Building Big," by David Macaulay, is published by Houghton Mifflin, ISBN # 0-395-96331-1, publication date October 2000.

is playing in this presidential election year. Many presidential candidates, including Lamar Alexander and Bob Dole, now have "home pages" on the World Wide Web. Alexander even announced his candidacy via the Internet. But while the candidates are doing their best to sell their message by way of cyberspace, some say they're merely preaching to the converted.

NPR's Jason Beaubien reports from Boston where the 105th Boston Marathon is off to a hi-tech start today. The marathon's 15,000 entrants will all have small computer chips tied to their shoelaces, sending instant updates of each runner's progress to the Internet for fans. Check out the Boston Marathon Web site.

In Oberlin, Ohio, young children have found a public voice -- over the airwaves of WOBC, the local college radio station. Two college seniors produce I'm on the Stereo, a program featuring interviews with -- and sometimes hosted by -- kids ages 4 to 18. Linda Wertheimer speaks with the producers of the show, and some of their young radio stars. (8:00) I'm on the Stereo's Web site.

What would you do if you stumbled across a friend's very personal Web log? Should you stop reading subsequent entries out of respect for her privacy? Randy Cohen, who writes "The Ethicist" column for The New York Times Magazine, discusses that ethical dilemma and others in his latest appearance on the show.

Michele Norris talks with Hamit Dardagan, co-founder and researcher of the Web site Iraq Body Count. The site, founded just before the 2003 invasion, tracks civilian deaths in Iraq due to the U.S.-led military presence. The count includes deaths caused by coalition as well as insurgent groups.

Grateful Dead fans can once again easily download their favorite concert recordings. The band initially asked the Web site to stop the practice, but backed down after fans' outrage. Commentator Jake Halpern wonders if he is the only fan who is disappointed by the news.

What happens when you put a handful of Mentos candy into a bottle of diet soda? As many fans of Web video have found out, the results are pretty explosive. And there is actually a scientific explanation.

At the Chinese Theatre in Hollywood, a gaggle of fans wait for the final episode of the six-picture Star Wars saga. It won't open until midnight May 19, but fans have been there for weeks. The line has a Web site and strict rules for joining the lineup.

Robert Siegel talks with Tian Tang, author of a Web site dedicated to the misuse of Chinese characters in Western culture. Tang posts photos of Chinese character tattoos that either contain errors or carry no meaning. Tang says as a Chinese American, he felt it was his "duty and honor to educate the public about the misusage of Chinese characters."