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I still find people who do this
(slrpnk.net)
At my last job, a bunch of the older folks did not realize they had a "two spaces" habit.
It's a clear tell.
Saw this meme and thought I'd point that out.
It's better to have two spaces after periods with most fonts. It's not good when the commas and periods blend together. Nice to know at a glance where the ends of sentences are. If you look at it with fresh eyes, forgetting about what you're supposed to think, you'll probably end up with two spaces after periods, at least most of the time.