We like them all -- but as with all books, you will have your own tolerance for content. They definitely make jokes are are "gross" at times. Not in a bad way, but if you are super sensitive, you might want to preview them first. We are pretty conservative, and I've been okay with the content. :)
When I was 10 years old the gross nature of the jokes realy made me love those books,up to that point I was only familiar to science magazines that target the laymen adult and they tend to be lacking in british humor,specialy the ones we had here in Brazil
