If the old Rice-a-Roni commercial theme song used to get stuck in your head, imagine listening to people sing it every day.

Chances are, you've seen a television show, movie, postcard or some type of San Francisco memorabilia emblazoned with the city's iconic cable car or trolley. So, of course, to fully experience San ...

Urban planners from Mexico City to Toulouse are adopting the high-flying mode of transit. Will it catch on elsewhere?