I work with a lot of people who write software and a few professional developers (~10-20 years experience in .NET & Java) and only one of them (has a computer science degree) has ever heard of Prolog and neither had ever heard of Smalltalk, APL, Forth, or Lisp when I brought them up around lunch. They're great at what they do and are much more experienced/talented than I at creating software, but it always makes me wonder why more professional software developers aren't more curious about the past and other alternative solutions. I can tell you how engineers did my job each decade going about 100 years back and how all the tools evolved over that time.