In San Francisco, demand for apartments is booming — but for low- and middle-income tenants, this means it's hard to find an affordable place to rent. Curtis Fry/Flickr hide caption

Security officer Steven Long patrols the Sequoyah Hills neighborhood in Oakland, Calif. With city police struggling to control crime, several neighborhoods have hired private security to patrol local streets. Justin Sullivan/Getty Images hide caption

There were 1.5 million boardings on the Emery Go Round last year. Zikhona Tetana, a visiting scientist from South Africa, is taking the Emery Go Round to a Lawrence Berkeley National Laboratory facility in Emeryville. "It's convenient and always on time," she says. Cindy Carpien/NPR hide caption

Hundreds of protesters march toward the Sonoma County Sheriff's Office in response to the death of Andy Lopez in Santa Rosa. Noah Berger/Reuters/Landov hide caption

Dona Ana County Clerk Lynn Ellins talks with Thom Hinks and Richard Sunman (far right) after they obtained a marriage license at the Dona Ana County Clerk's Office in Las Cruces, N.M. In August, Ellins' office began issuing marriage licenses to same-sex couples. Juan Carlos Llorca/AP hide caption