Well, I don't think they are used in education, I've just found it in my old books and decided to remind myself old times ;) without serious update, the book won't be useful now - even if I like it's graphics, and the manner they communicate with children (it worked very well with me, helping to arouse the interest in the geography and the world).
As for posting more often - that is something I try, currently there are some 3-4 books more that I've already read this year, the texts about them are almost ready, so probably I will publish them soon :)