On May 3, 1971, at 5 p.m., All Things Considered debuted on 90 public radio stations.

In the 40 years since, almost everything about the program has changed, from the hosts, producers, editors and reporters to the length of the program, the equipment used and even the audience.

However there is one thing that remains the same: each show consists of the biggest stories of the day, thoughtful commentaries, insightful features on the quirky and the mainstream in arts and life, music and entertainment, all brought alive through sound.