One space after a period or two?

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I learned touch typing on a manual typewriter. We were taught two spaces following a period.

A typewriter uses a fixed spacing, where an “i” and a “w” take up the same space. The two space rule helps readers to see the sentence break better.

Today, one can have proportional spaced fonts. So arose a heretical group, who hold that one space is sufficient. These heretics are possibly influenced by a certain social media site, where only 280 characters, spaces included, are allowed.

One psychophysical study has shown that there is a slight improvement in reading speeds with two spaces. (YMMV, but unquestionably, reading speed improves if you don’t move your lips.)

I would add something that many artists know explicitly or instinctively. That is, the judicious use of negative space or ma. Ma (Japanese) refers to spare garden designs. It also works in art or in writing.

These thoughts are cast as short sentences and paragraphs and extra returns for paragraph spacing. Negative space. Plenty of ma.

Less is more.

I have also heard that one tell used to detect cheaters, who use a third party to write an essay for them, is whether or not the spacing after a period is consistent.

Or do you prefer:

I learned touch typing on a manual typewriter. We were taught two spaces following a period. A typewriter uses a fixed spacing, where an “i” and a “w” take up the same space. he two space rule helps readers to see the sentence break better.Today, one can have proportional spaced fonts. So arose a heretical group, who hold that one space is sufficient. These heretics are possibly influenced by a certain social media site, where only 280 characters, spaces included, are allowed. One psychophysical study has shown that there is a slight improvement in reading speeds with two spaces. (YMMV, but unquestionably, reading speed improves if you don’t move your lips.) I would add something that many artists know explicitly or instinctively. That is, the judicious use of negative space or ma. Ma (Japanese) refers to spare garden designs. It also works in art or in writing. These thoughts are cast as short sentences and paragraphs and extra returns for paragraph spacing. No negative space. No ma. Less is more. I have also heard that one tell used to detect cheaters, who use a third party to write an essay for them, is whether or not the spacing after a period is consistent.

So are you a one space or two kind of person?