They are a reminder of how your own romantic life has hit the skids, and now you're trapped in the security queue, a passive observer of true love.

Throughout the 1990s, the concept of a passive observer/researcher was rejected, and qualitative research became more participatory and activist-oriented.

They have has none of the smoke, ash or stale smell that makes smoking unpleasant, not to say dangerous, for passive observers.

They demonstrated they were not just passive observers of the democratic process but participants.

He achieved fame by groundbreaking programs where he took himself and the microphone to participate in various extraordinary events, such as diving and parachuting, instead of remaining a passive observer.