Unrelated: I just want to mention the clarity of enunciation of people of this era. They spoke with this wonderful crystalline voice that is so pleasant to hear. Similar can be heard in Bell Labs demonstrations and other 1950-1980 clips. I think part of it is the audio processing and low-pass filtering, but I think the accent and our discipline of the language has changed dramatically. In America, many kids today cannot go longer in a sentence without uttering 'like' and 'um'.