I remember seeing a documentary about leaked details of satellites that could read the headlines off a newspaper in the early 1970s, but they would have had very low orbits and didn't stay up long, mainly because they would run out of film.
German newspaper Der Spiegel once called the movement 'a grassroots democracy where no one is showing up to participate.'"
They were obviously astroturfing by not showing up to participate.
For old analogue audio recordings, being able to tweak the audio head azimuth will help bring out the best of the recording. I also consider this essential for archiving cassette and open reel recordings. You have to hear how much difference being able to tweak aziumuth makes to believe it. It is a critical adjustment and the playback azimuth has to match that of the recorder otherwise all your top end goes down the plug-hole and it sounds washed out.