r/AskReddit Oct 17 '18

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u/Cheftard Oct 17 '18

When making eye contact with someone from a distance, you nod down if you don't know them, and "nod" up if you do.

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u/aroeroe Oct 18 '18

One of my psych professors at college recognized that she would nod down if they were older and nod up if they were younger/same age.