But you remember "Braindrain," an HBO series of short animated films based on educational issues. It's intimately associated with "Fraggle Rock" to me, because those two were the only thing I really watched on HBO. I remember segments based on memory, where they showed scenes and you had to find the things missing, and mathematical games. The opening was cool, a series of people whispering "braindrain" with increasingly loud voices until it became one guy yelling "Brain Drain!" It was loads of fun.
This was a tough one, because HBO's "Brain Drain" seems to be the only TV show in the universe that doesn't have a hardcore fan following. The only article I could find on it was a review of the videotapes. Turns out there were only six episodes, chopped up and reformed into different episodes. I remember more than that, but also remember a lot of repeats. I'm surprised that "SuperGran" got more attention than "Brain Drain," a truly great educational series before Bill Nye came along.