Not relevant to a sudden dip, but overall my observation is that retro computing interest tends to focus on a period 30-40 years ago. For example, in the late 80’s people were going retro on the LGP-30, the story of Mel, etc. Probably this matches with people retracing their formative years in the industry when they retire. If correct, we should see a rise in interest around early Linux in the upcoming years, with interest in 80’s Unix and early networking declining. We’re probably already past peak for interest in 1970’s Unix. The historical log of this mailing list is important. Documenting historical events will get much harder after the "40 year window" has closed. Paul