https://arstechnica.com/science/2018/05 ... udy-finds/Two spaces after period are better than one, except maybe they aren’t, study finds
After APA style change sets world afire, researchers justify double-space but plea for peace.
In what may be one of the most controversial studies of the year, researchers at Skidmore College—clearly triggered by a change in the American Psychological Association (APA) style book—sought to quantify the benefits of two spaces after a period at the end of a sentence. After conducting an eye-tracking experiment with 60 Skidmore students, Rebecca L. Johnson, Becky Bui, and Lindsay L. Schmitt found that two spaces at the end of a period slightly improved the processing of text during reading. The research was trumpeted by some press outlets as a vindication of two-spacers' superiority.
For anyone who learned their keyboarding skills on a typewriter rather than a computer—and for the many who developed their keyboard muscle memory using software packages such as Mavis Beacon Teaches Typing—the double-space after the period is a deeply ingrained truth. While modern style, based on the fallacy that computer typography makes such double-spaces redundant and Paleolithic, has demanded the deprecation of the second tap of the space bar after a punctuation full-stop, many have openly resisted this heresy, believing that the extra space is a courtesy to the reader and enhances the legibility of the text.
Like every oldster that first typed using a manual typewriter with a monospace font, the double space is ingrained in muscle memory. I realize that it is visually unnecessary in any proportional font and converted to single space in any form of HTML regardless of the font, yet my fingers do it anyway. Sue them. I am otherwise agnostic on the issue so don't flame me, bro.