I apologize for going off-topic, but I find this rather amusing.
It seems Google's AdSense cannot figure out what this blog is about. For a long time now it has been showing ads about real-life construction, churches, Christmas trees, family trees, prune your trees. I just took this screenshot:
The funny thing is Google has all the information it needs to discover what the people who read this page care about. It seems they are just matching words and hoping for the best. If they were paying attention to the comments, all the posts, the links, they could figure it out. This blog is also hosted by Blogger, which is owned by Google. They could make sure there is good metadata for their engine to discover. There are even tags to associated to each post.
They say their algorithm is intelligent. I agree, only it is same level of intelligence that allows a dog chase its own tail for hours.