Lumifer comments on Stupid Questions, December 2015 - Less Wrong Discussion
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I gave my book to my dad and I noticed him licking his finger to turn pages. I exploded and took the book away from him. I apologized later and explained this annoys me to no end.
Can anyone explain why people do it? FWIW I occasionally had two page turn at once and very rarely three at ones. I'm guessing it's something with the ink, just to make my head work a bit. Or perhaps something to do with older books. Can anyone explain why people do this? I ran a search and I only got even more questions, like if it spreads germs.
(My dad said he always did it, so he's rather unhelpful too)
A dry finger slides easily on paper, a wet finger sticks to it (and moves it).
Cashiers often have a wet sponge on hand to moisten their finger when counting banknotes.