Fresh Air with Terry Gross

On his major-label debut Blak and Blu, you can hear the roar in Gary Clark Jr.'s blues guitar, and in his vocal throughout "Bright Lights." It's one of the few straight-up blues songs on what is essentially an introduction to one of the most highly praised young blues guitarists in recent times. While Clark comes out of a blues tradition, he's also a twentysomething who's taken in all of contemporary music.

In 1983, Berkeley poet and journalist Mark O'Brien wrote an article about sexual surrogates — women and men trained to help people with disabilities learn to use their bodies to give themselves and others erotic pleasure.

For O'Brien, the subject wasn't academic. After a bout of childhood polio, he had spent much of his life in an iron lung. He could talk, and tap out words on a typewriter holding a stick in his mouth. He could feel things below the neck. But he couldn't move his muscles.

As soon as Sherry Turkle arrived at the studio for her Fresh Air interview, she realized she'd forgotten her phone. "I realized I'd left it behind, and I felt a moment of Oh my god ... and I felt it kind of in the pit of my stomach," she tells Terry Gross. That feeling of emotional dependence on digital devices is the focus of Turkle's research. Her book, Alone Together, explores how new technology is changing the way we communicate with one another.