It's one of the ultimate images of summer: a woman in a short, pink slip sits on a bed, her knees pulled up to her chest, gazing out a window. Her hair is tucked back into a bun. Her bare arms rest lightly on her bare legs.

Edward Hopper painted her in 1952 for a work called Morning Sun. The picture has been widely reproduced for decades. But on a recent visit to its home at the Columbus Museum of Art in Columbus, Ohio, it was nowhere to be found.

Six years ago, we told you about a woman, identified as A.J., who could remember the details of nearly every day of her life. At the time, researchers thought she was unique. But since then, a handful of such individuals have been identified. And now, researchers are trying to understand how their extraordinary memories work.

Ever wonder how charitable the people are who live in your state or community? It turns out that lower-income people tend to donate a much bigger share of their discretionary incomes than wealthier people do. And rich people are more generous when they live among those who aren't so rich.

Roxana Castro sits in an orange chair in the waiting room at Mary's Center in Washington, D.C. She's 17, and expecting a baby boy next month. The pregnancy was a surprise, she says, mostly for her parents, but also for the baby's father.

Even with her mother's help, Castro admits she's nervous. The father of the baby says he'll be there, but she knows this is a big responsibility, and says she's not ready to start a family just yet.

"A baby is so fragile," she says. "I don't know how to take care of it or anything."

Weekends on All Things Considered continues its "Why Music Matters" series with a story from the operating room.

"The O.R. is a naturally rhythmic place, in that you have the beating of the anesthesia machines and the autoclave comes on," says Divya Singh, an orthopedic and hand surgeon. "So music just becomes another sound."