I found this article about the use of two spaces after periods when you type on a keyboard. It seems that texts are easier to read when you put two spaces after a period at the end of sentences.
“Increased spacing has been shown to help facilitate processing in a number of other reading studies,” Johnson explained to me by email, using two spaces after each period. “Removing the spaces between words altogether drastically hurts our ability to read fluently, and increasing the amount of space between words helps us process the text.”
I don’t write double spaces. Do you?
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