As you know, many people would claim that "can not" is correct as it is another form of "cannot". What's the reason that almost all educated people insist on using "cannot"? (I would personally lean towards using "cannot" inasmuch as using "can not" runs me the risk of looking uneducated. However, I am curious to know why most of our dictionaries define "cannot" as: another form of "can not"? I have also seen that "can not" is considered as the ordinary modern way of writing "cannot". I would be happy If you could offer a little clarification.
"Can not" doesn't worry me at all. I didn't know it was supposed to be a problem until I came here, and I've been writing good Australian English for 50+ years. No other modal verb is combined with 'not'.
Others obviously have a different opinion.