In our second episode of Cocktail Party Science, host Chuck Cage, executive editor Mike Haney and Web editor Megan Miller sit down with Catherine Price, author of "The Anonymity Experiment." Find out how to keep your online activity hidden, what the spy bill means for our civil rights, and whether its possible to truly "disappear."

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In 2006, David Holtzman decided to do an experiment. Holtzman, a security consultant and former intelligence analyst, was working on a book about privacy, and he wanted to see how much he could find out about himself from sources available to any tenacious stalker. So he did background checks. He pulled his credit file. He looked at Amazon.com transactions and his credit-card and telephone bills. He got his DNA analyzed and kept a log of all the people he called and e-mailed, along with the Web sites he visited.

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