I have been encountering more and more instances of one space after periods, between sentences. I was always
taught two (2) spaces -- like I'm doing in this post (and every other post I've ever written on LGP). I think it would take several months to retrain my thumb to type only one space.
I've yet to see any reputable source state that one space is proper. I have always understood that one space is permissible in print journalism where page space is important, but that is the only time I've ever heard of one space being proper.
In particular, I've been seeing a ton of legal work lately that contains only one space after periods. I can't imagine this would ever be preferred by courts, where readability should be the chief concern when establishing typographic rules.
What say you? Am I missing something?
Edit: Upon completing this post I realized that LGP changes my two spaces to one.