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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.
I'm in the first half of my 40s. I was taught on typewriters in middle school and have been putting two spaces when using a physical keyboard ever since.