http://www.slate.com/articles/technology/technology/2011/01/...
http://www.slate.com/articles/technology/technology/2011/01/...
You seem to be having difficulty distinguishing opinions from facts.
A good habit to get into is always question what you are taught. And if the answer you are given is, "because that's the way it has always been done," then assume it is wrong.
Literally the only argument for double spacing is that it provides semantic separation. Except we already have something that does that. It's called a period. So when you are using both a period and double spacing, you are being redundant.
N is at least 8 to 1.
"Who says two spaces is wrong?" they wanted to know. Typographers, that's who. The people who study and design the typewritten word decided long ago that we should use one space, not two, between sentences.
The only argument (which is apparently historically inaccurate according to the parent article) made against double-spacing is an appeal to authority and 'the way it's always been done', exactly what you are rallying against in your last reply.
Besides, as has been pointed out already in this thread, a period followed by a single space (followed by a capitalized letter) does not solely occur in end-of-sentence contexts, so a period followed by two spaces does provide an added degree of semantic separation.
Personally, I have no preference. You do what you like, I'll do what looks good to me. I am amazed that someone would assume that I was uneducated or ignorant (like the typographer interviewed in the Slate article), because I usually put two spaces after a sentence-ending period.
"Mr. and Mrs. Jones went to St. Maarten, to see Mr. Jones, Jr. Ph.D., an M.D. who was studying further to get his D.D.S. from noted dentist, W.E.B. DuBois."
Having had to do it before, I can tell you that I've yet to find a bullet-proof way to parse that sentence (programmatically) and guarantee that you weren't going to get random sentence parts.
Assuming pristine data, I could just split on .<space><space> and be done with it.