Ahh ok that sorta makes sense then...I was hitting a point where it seemed I wasn't getting very much impact on science, if any, for the books I was putting in(Couldn't tell though). But from the sounds of it there is no max, just the growth potential becomes exponentially more costly and, consequently, far more time consuming the more pumped you seem to be, which would explain why I thought I was still seeing small increases in my science at this point, but very very little.

Thanks for the answers guys!!