Period Problems

No, I'm not talking about what you're thinking!  I'm talking about the one that comes after a sentence!

I just read this article:    http://www.slate.com/articles/technology/technology/2011/01/space_invaders.html

Shared by a fellow facebook/goodreads/google+ friend    

Now back in the day, when computers were a thing of the future, we were always taught two spaces after a period.  Does everyone else remember this too?  My current book, my new book, and my new, new book (what I have typed of it) all have two spaces after the period!

Now, I know that I didn't pay attention in high school typing class. But the one golden rule that I always remembered was, 1 space after a comma and 2 spaces after a period.  Please tell me I'm not imaging this and that I did get something out of that typing class, instead of just getting yelled at by teacher for always fooling around with my best friend.  Anyone else remember this???

Seems like whenever this word is mentioned - it's nothing but aggravation!

Oh, and you will happy to know that my typing has improved tremendously since Mrs. Carl's 9th grade typing class!