I really enjoy playing the quizzes on this site and they can be very educational. The downside is that the owners of the site seem desperate for people to subscribe by placing a massive amount of ads on the site which cover up some of the quizzes, these are removed if you subscribe which I don't intend to do as I understand you get bombarded with emails. Ad block plus eventually dealt with this but when you have completed a quiz they put very sarcastic comments in an attempt to belittle you if you don't do very well - you can remove these comments only if you subscribe. Good quizzes but arrogant, egotistical owners.