Linton Weeks Linton Weeks joined NPR in the summer of 2008, as its national correspondent for Digital News.

British forces clash with colonial militia during the Battle of Bunker Hill in 1775, as depicted in an illustration. Hulton Archive/Getty Images hide caption

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Hulton Archive/Getty Images

If Greta Garbo — the iconic movie star who famously wanted to be left alone — were around today, she might be a prime customer of the online privacy industry. Fox Photos/Getty Images hide caption

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Fox Photos/Getty Images

Actress Reese Witherspoon is among a number of celebrities who yearn for privacy. Peter Kramer/AP hide caption

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Peter Kramer/AP

A demonstrator waves a flag marked with the peace symbol on Jan. 26, 1991, during an anti-Gulf War rally at the U.S. Capitol in Washington, D.C. Kevin Larkin/AFP/Getty Images hide caption

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Kevin Larkin/AFP/Getty Images

President Obama has "often confounded his opponents by defying political stereotypes," says Julian Zelizer, a presidential historian at Princeton University. Saul Loeb/AFP/Getty Images hide caption

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Saul Loeb/AFP/Getty Images

The USS Barry launches a Tomahawk cruise missile Saturday in support of Operation Odyssey Dawn. The operation targeted radar and anti-aircraft sites along Libya's Mediterranean coast. U.S. Navy/Getty Images hide caption

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U.S. Navy/Getty Images

A fallout shelter sign graces the Madison County Courthouse in Huntsville, Ala., in 2007. The county is working on a plan to identify shelters that can house up to 300,000 people in the event of a nuclear incident. Dave Martin/AP hide caption

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Dave Martin/AP

A 1923 earthquake leveled much of Tokyo and Yokohama, Japan, killing more than 140,000 people. AP hide caption

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AP

A True Hero? President Obama presents the Medal of Honor to Staff Sgt. Salvatore Giunta in the East Room of the White House last November. Asked if he's a hero, Giunta said, "I am only mediocre. I'm average, and by no means did I do anything that anyone else wouldn't have done in that situation." Courtesy of the White House hide caption

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Courtesy of the White House

A VU Pioneer TX-9500 II. There are still people willing to drop a large chunk of their income on the best audio equipment available, says music professor Mark Katz. "That said," he adds, "the landscape — or perhaps soundscape — has changed." dogulove /via Flickr hide caption

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dogulove /via Flickr