You can pry my double spacing from my cold dead hands [The More You Know]

Apparently… since 1999, it’s been correct to only use one space after a sentence period break, not two. However, unless there’s some specific reason to have even spacing between all characters, I still think that the double space looks much nicer and gives you some visual breathing space between sentences. The idea is that in the modern era, typography is clean and even enough that you don’t need more than one space to make a distinction between one sentence and the other as opposed to a time when the process of printing type was messier and the full stop was necessary to ensure legibility.

From the Elements of Web Typographic Style Guide:

In the nineteenth century, which was a dark and inflationary age in typography and type design, many compositors were encouraged to stuff extra space between sentences. Generations of twentieth century typists were then taught to do the same, by hitting the spacebar twice after every period [full stop]. Your typing as well as your typesetting will benefit from unlearning this quaint Victorian habit. As a general rule, no more than a single space is required after a period, colon or any other mark of punctuation.

And from Wikipedia:

In modern English-language typographical usage, debate has arisen concerning the proper number of trailing spaces after a full stop (or exclamation mark, or question mark) to separate sentences within a paragraph. Whereas two spaces are still regarded by many outside the publishing industry to be the better usage for monospace typefaces, the awkwardness that most word-processing applications have in representing correctly the 1.5 spaces that had previously become standard for typographically proportional (non-monospace) fonts has led to some confusion about how to render the space between sentences using only word-processing tools.

I think we should go back to using those stylized lowercase s’s that look life f’s. For fure.