Could have also been early 90's. The show used to come on everyday and talked about chemistry, math, and all sorts of scientific concepts. What stood out is how the show would use 3d graphics to explain all the concepts. Like the episode about electrons and neutrons had all kinds of cool 3d simulations of how they interact with each other and how atoms are formed. I know someone has to remember this. I'm dying to watch this show again.
Hmm, if you aren't talking about 3 2 1 Contact, there was also another show that was aired on PBS stations during instructional television day time blocks. I'm unsure of the name, but I do recall it. I think it was probably produced by TV Ontario. That one used CG during the majority of the program.
There was also another science show called 'Eureka' from the 80's, but that one was completely hand drawn animation.