If I understand correctly, the original source is this. I can't find any way to access it online, but everyone who talks about it says the results mentioned in that blog post and no one says otherwise, so I'm assuming they didn't just make it up.
I'm impressed. I took a look at various sources, and it seems like you can't even buy a used copy of that book anymore - it only exists in various academic libraries, and in many of them, it's stored only as microfiche/microfilm.
Information that surprises you is interesting as it exposes where you have been miscalibrated, and allows you to correct for that.
I suspect the users of LessWrong have fairly similar beliefs, so it is probable that information that has surprised you would surprise others here, so it would be useful for them if you shared them.
Example: In a discussion with a friend recently I realised I had massively miscalibrated on the percentage of the UK population who shared my beliefs on certain subjects, in general the population was far more conservative than I had expected.
In retrospect I was assuming my own personal experience was more representative than it was, even when attempting to correct for that.