[bear8642]

Likely because whilst it didn't work out commercially, the ideas smalltalk, prolog and other more esoteric languages (forth, apl) focus on are themselves very interesting.

[ux266478]

In what world did Prolog not work out commercially? It's still used where it makes sense to do so.

[bear8642]

oh, thanks! I didn't know that Prolog was still used commercially.