30 years of GNU

We had an old Unix machine (I forget what variety) in our department where I was a student in the mid 1990s which came with five terminals with green plain-text screens (VT100 compatible). It was kept in the common student area but we had at least one professor who would only ever use those terminals for sending email (he used computers for little else), because he didn't know how to use these newfangled window-based thingies. Alas, the machine was eventually retired...