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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 saw an analysis of the Cicada 3301 mystery which noticed a double space in the original final.jpg image to conclude it was probably written by an older and probably college educated American, as the practice is somewhat peculiar to Americans who took formal typing classes either in college before the 90's or in high school after the 90's.