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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.
Our typing software had it that way in 2000, so if you wanted to pass, you would have had to type 2 spaces after a period. Originally I think it is was about fonts not being so easy to seperate text apart so it would be easier to notice a thought being started/ended when skimming