It is very hard to turn pages if your fingers are too dry (or lack oil). Most people turn pages by using the friction of their fingers against the face of the page, rather than hunting for the edge of the page. Very dry skin doesn't present much friction, and your fingers just slide along the page.
I usually blow on my fingers, on the theory that it is slightly more sanitary, and provides enough moisture to 'grip' the paper.
It is very hard to turn pages if your fingers are too dry (or lack oil).
I have never found that. I always turn pages by the edge, and find the idea of licking my fingers to turn them revolting.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.