Can't praise this series of books enough. Got one & then had to collect them all! Factual content is presented well, with many interesting points & just enough text to inform without boring. Text is surrounded by LOTS of colourful illustrations & photos along with numerous 'craft' projects appropriate to each books theme. These are ALL appropriate for teachers to use in the classroom or for parents to make with their children, none are too complicated. No difficult to obtain materials used. LOVE, LOVE, LOVE these.