I'm Curious Here

About once a week, I get a big bounce on this blog from readers in Germany. It might be twice a week. But I go from my normal 100-200 blog looks daily to 700-800 once or twice a week--and once it was 6,000 in a day a couple of years ago. So is someone just pressing buttons? I mean, I don't have ads, so I can't make money from someone just pressing buttons. Or does some teacher in a high school or college english class use my blog and so he/she has a lot of students looking at it?
   Just curious if anyone out there wants to take the veil off the mystery here.