I missed the same one as flippyshark and engaged in similar head smacking. I also missed the "geographic" one, again a cultural bias, I think.
I did get one more, but I kind of cheated. I knew what it was about, but I didn't know one of the terms, so I googled. But in my defense, I googled the specific topic (which was one of the terms to guess), so I think I get some credit.