My three girls and I have been reading this series since they were three years old. I can still remember picking up book one, Dinosaurs at Daybreak, telling the girls we would read one chapter and being so enthralled we had to read one more and when getting to the end of the next chapter they would say, "we can't stop there, we have to know what happens." Forty-five minutes later we had read the whole book and were completely hooked! They are now eight years old and we are on book 39 and read every morning before school to get there heads read to learn.
The books are fun, informative, creative, imaginative and engaging. We have been to few places that we first read about in the research guides, like the Tar Pits in L.A. It helps bring the story to life and impresses upon their minds the facts that they have read about.