Well, this is exactly what I found interesting. When you talk to people who are "readers" (as in - have been reading for a while), this seems to be a "normal" for them.

And yet, go and talk to anyone (myself included) who was never into reading, and you'll encounter complete shock once you mention "reading more than one book at a time". It's funny, I know, but it's mind blowing for us who never "learned" how to read :)