This book has been a very enjoyable and informative read for us. Our four-year-old has asked to read it many times now, after we read it for pre-K.
This book is actually three "books" combined. The first section is the Almanac, which introduces children to the concept of a "year," and all the different changes that take place over the course of it, from major holidays such as New Year's, Independence Day, and Thanksgiving, to seasons and the way the weather changes in each one, and explanations of major weather events like thunderstorms, wind, and snow.
The second section is the Nature Guide. This gives an overview of all the different kinds of life on our planet, as well as non-living things like rocks and other geographical features. From fish to mammals to plants and insects, the bears (with Papa as tour guide) experience a little bit of just about everything!
The last section is the Science Fair, which I found to be a bit more detailed than the others, but still just as fun. We learn about simple machines, matter (including the three states of solid, liquid, and gas), and energy. Included are a few easy science experiments that children and adults can do at home to help demonstrate some of these ideas.
Even though it's instructive, the book manages to rhyme throughout most of it, which adds to the fun of reading.