Generally specialist books can only be read by people with the right training. It's a craft issue not an intelligence one.
I wonder how many people here could read Metahistory in a meaningful fashion? Probably less. What would that prove? Very little.
Yeah, that was my point exactly. Anything beyond introductory level in any science should, by definition, be incomprehensible for someone who hasn't studied at least upto that level.
Then, of course, there are things like management books who are incomprehensible to everyone at all levels, but that's another story.