The fall equinox, which arrives Tuesday in the U.S., brings shorter days, and chances to witness alignment between Earth and the sun. It's a modern version of ancient observances of a celestial shift.

A self-described "folkie to the bone," Giddens sings and plays banjo and fiddle in this interview. Her latest album, Hope Is the Thing with Feathers, takes its name from an Emily Dickinson poem.

The Federal Aviation Administration launched an ambitious $875-million-dollar push to make the U.S. airspace more efficient. But critics say it won't solve bigger problems with air traffic control.