Audi's night vision assistant, an example of how car companies are making cars that are part of drivers' digital lives. Courtesy of Audi hide caption

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To teens today, cars aren't important in the same way they were in American Graffiti, the 1973 film directed by George Lucas. Lucasfilm/Coppola Co/Universal hide caption

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Employment Specialist Louis Holliday, right, helps an applicant file for unemployment at a Georgia Department of Labor career center last month in Atlanta. The jobless rate for African-Americans fell from 13.7 to 12.6 percent in July, but that's still twice the rate for whites. David Goldman/AP hide caption

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A version of Ford's flagship F-150 pickup truck that runs on natural gas. Courtesy of Ford Motor Company hide caption

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Woodward Avenue runs through Midtown, a Detroit neighborhood that is reviving in the midst of the larger city's decline. In the background is downtown Detroit. Carlos Osorio/AP hide caption

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