Former President Bill Clinton speaks at Scranton High School on Tuesday at a rally for U.S. Senate candidate Joe Sestak in Pennsylvania. Jason Farmer/The Scranton Times-Tribune/AP hide caption

Unlike most L.A. motorists, Kyack and his collaborators actively seek out the most congested sections of the highway. The tailgate sign tells other drivers how to tune in to the show's dialogue. Amy Walters/NPR hide caption

As humans evolved, our throats got longer and our mouths got smaller -- physiological changes that enabled us to effectively shape and control sound. According to fossils, the first humans who had an anatomy capable of speech patterns appeared about 50,000 years ago. Hulton Archive/Getty Images hide caption

Oil workers listen to Louisiana Gov. Bobby Jindal during a speech in June in Houma, La. Jindal spoke out against the six-month moratorium on deep-water drilling, saying it would kill thousands of Louisiana jobs. Gregory Bull/AP hide caption

Jose Guevara, a cab driver for 30 years, leans on his trusty Crown Victoria. Ford is discontinuing the popular fleet vehicle in 2011, leaving the New York City Taxi and Limousine Commission in search of a replacement. Brian Reed/NPR hide caption

Fidel Castro speaks during a special session of Cuba's parliament Saturday in Havana. The former Cuban leader, who turns 84 on Friday, is making near daily appearances in and around Havana -- four years after health problems forced him to cede power to his younger brother Raul. Javier Galeano/AP hide caption

The stories in Rosanne Cash's memoir are rendered like the lyrics of a good country song. Deborah Feingold hide caption