How Did They Find That Out?

So after I submitted my last blog post, Google gave me the normal screen showing that everything was hunky-dory.


So while I usually tune out advertisements, I just happened to look at the one on the side of the screen here:
And it makes me wonder: how did they know that about me? They're, like, totally inside my head or something....

:-)

Now if they could just figure out a way to let me blog in the Elder Futhark, then my life would be complete.