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This doesn't look like your trusty potato battery: a prototype device made by scientists at the University of Maryland uses wood fibers coated with carbon nanotubes to create an electric current.

Car enthusiasts are trekking across the U.S. this year along Lincoln Highway. The transcontinental trips are part of centennial activities for the road known as "The Main Street Across America," and a unique group of tourists started their journey all the way in Norway.

U.S. Attorney General Eric Holder was speaking at the NAACP's annual convention in Orlando, Fla., a short distance from where unarmed black teenager Trayvon Martin was shot and killed last year. More than two dozen states have laws that allow people to use deadly force to defend themselves if they believe they are under attack.

The tragedy sparked violent protests in the eastern state of Bihar. A mob smashed the windows of police buses and overturned a police booth. All of the children who died were between the ages of 8 and 11.

Also: Jonathan Franzen answers an odd accusation; Zadie Smith's next book will be a "science-fiction romp."

The Federal Reserve Chairman continued to soothe investors, saying the Fed would not wind down its bond-buying program until economic conditions improve.

Police have scanned millions of license plates around the country and can save the data on vehicle locations for later use. It's a helpful tool for policing, but critics say it's a threat to privacy.

After television appearances from Rachel Jeantel and Juror B37, the Zimmerman verdict is leading the conversation in this week's Beauty Shop. Host Michel Martin is joined by Clutch Magazine's Danielle Belton, PJ Media's Bridget Johnson, and The Root.com's Keli Goff.

The Bay Area station KTVU offered an apology for airing the bogus names of the crew piloting the 777 that crash-landed in San Francisco. The apology satisfied the airline.

The singer-songwriter earned a name for himself while playing with Drive-By Truckers and The 400 Unit, but on his new album — written after he got sober — Isbell finds a new level of emotional honesty. Here, he talks with Terry Gross about his life and plays songs from Southeastern.