big in japan

I love the Japanese Tumblr users but find myself having a hard time following them since I don't understand the language. So I'm trying to find the content they have that's great and also easily understandable. This tumblelog is highly not safe for work. Enjoy!
March 3
“ 日本人の知能は、両生類以下だということか。

二つの都市伝説 - 池田信夫 blog (via tnoma) (via neodenjin)

Can anyone give me a good english translation of this? I ran it through google translator and it gave me: ” Japanese intelligence, or that the amphibians.”