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Re:A Nerd’s Way to Walk Up the Stairs (2011) by gniv on Saturday August 18, 2018 @07:40PM (#17791536)
That was my thought too, but I think the point is subtler. The kind of person who notices those things is good at noticing a lot of things.

I like this relevant scene: https://youtu.be/IjrWOZby8s8?t=47s

Re:A Nerd’s Way to Walk Up the Stairs (2011) by joewee on Saturday August 18, 2018 @09:50PM (#17792064)
Sort of like preppers who teach themselves to identify exits in any venue they enter and how to spot someone that looks out of place. With time you can teach yourself to identify details everyone else ignores, if you have good reason to.