It’s a generational thing. If you learned to type on a manual typewriter, you likely put two spaces after a period. Like that. If you learned to type on an electric typewriter or a computer (most everyone), you likely put one space after a period. Like this.
I learned to type on an electric at school and a manual at home. I was a two spacer. Then I purchased a Mac Plus computer, and I became a one spacer. I prefer one space.
Business Insider’s Farhad Manjoo, offers this commentary: Why You Should Never, Ever Put Two Spaces After A Period
The problem with typewriters was that they used monospaced type—that is, every character occupied an equal amount of horizontal space. This bucked a long tradition of proportional typesetting, in which skinny characters (like I or 1) were given less space than fat ones (like W or M).
Monospaced type gives you text that looks “loose” and uneven; there’s a lot of white space between characters and words, so it’s more difficult to spot the spaces between sentences immediately. Hence the adoption of the two-space rule—on a typewriter, an extra space after a sentence makes text easier to read. Here’s the thing, though: Monospaced fonts went out in the 1970s.
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