In this week’s mental_floss video, John Green returns to give is a barrage of interesting facts about amusement parks, and thrill rides in particular -some of them are much older than you thought. But there are amusement parks with no thrill rides at all, like the “sex park” in London. Others need a little explanation, so watch this and find out what “hundepruten” means. Unless you already know. Yes, New Jersey's Action Park is touched upon briefly.