The pronunciation of the word science seems to vary based on which part of the world you're in. I have heard it pronounced "sai-ens" and "saains" (think "signs"). I have check the dictionary, but ...
Over time, I have heard people pronounce the "n" on words like "known" (NO-en) and "pattern" (PAT-r-en), as though it were a separate syllable. The instances of my hearing such have been rare ones, ...