As reported by The Verge on April 24, Microsoft Word now auto-corrects the use of two spaces after a period at the end of a sentence. The battle, such as it was, should now be considered over. This influential article in Slate explains why the one-spacers – while correct during the era of typewriters, which made every letter and space the same size – have been wrong since the early 1990s and the widespread availability of proportional spacing in modern word processing software.