A mobile phone shows a Skype application. Josep Lago/AFP/Getty Images hide caption

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Aprovecho executive director Dean Still lights a "rocket stove." Once the fire is going, it takes only two or three sticks at a time to keep a pot of water boiling. Martin Kaste/NPR hide caption

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The home in Tucson, Ariz., where Jared Loughner, charged in a shooting that killed six and wounded more than a dozen, lived with his parents. AFP/AFP/Getty Images hide caption

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Emily Fernandez, holding her daughter Bethany, uses her Nook e-reader to browse some books at a Barnes & Noble in Hackensack, N.J. Privacy advocates are concerned about the data that manufacturers may be able to collect from e-readers. Mark Lennihan/AP hide caption

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A personal iPhone can be set up to receive company e-mail via a Microsoft Exchange Server. But once it is set up, the phone can receive a variety of commands from the server including a remote wipe, which can destroy all the data and disable the phone. Jeff Chiu/AP hide caption

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Maria Dominguez picks Gala apples in an orchard in Wapato, Wash., in 2007. Shannon Dininny/AP hide caption

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President Clinton and Democratic gubernatorial candidate and California Attorney General Jerry Brown wave to students at a rally in Los Angeles on Oct. 15. Clinton is as much of an asset to Democratic candidates as President Obama, and in some cases, more so. Kevork Djansezian/Getty Images hide caption

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Republican senatorial candidate Dino Rossi talks to supporters at his campaign office in Everett, Wash., on Tuesday. Rossi is challenging Democratic Sen. Patty Murray for her seat. Ted S. Warren/AP hide caption

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Technology to filter photos in Web searches may help the Justice Department curb online trafficking in child pornography. The department has thus far focused its efforts on prosecution, not prevention. iStockphoto.com hide caption

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Devon Energy Corp.'s steam generation plant uses steam-assisted gravity drainage to extract bitumen from oil sands near Conklin, Alberta, on June 28. Jimmy Jeong/Bloomberg via Getty Images hide caption

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Alvin Toffler, author of Future Shock, sits outside a restaurant on Sunset Blvd in Los Angeles on July 14. Martin Kaste/NPR hide caption

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A worker walks along a long pipeline used to convey sand pumped from 20,000 feet offshore to build barriers to keep oil from entering wetlands near Grand Isle, La., last month. Jae C. Hong/AP hide caption

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