Such a great series for preschool/early elementary school. This one talks about why things do what they do.

Buy why? This is a favorite question of kids of all ages! This brightly colored, real-life illustrated book answers more why questions than your child or student could ever come up with. It tackles questions like, “why does my skin wrinkle in the tub?” and “why do we see a rainbow?” It even has science experiments that go along with some of the questions, such as making a rainbow, using a piece of white paper, a glass of water, and sunlight. Either at home or in the classroom, this book offers hours of science enjoyment through both reading and hands-on experiments. ( )

Pretty much every two year old's favorite world is WHY? This is a good book for everyone to learn something from. This is also great book that answers so many questions that we have every day. Very educational and makes learning fun! ( )

The National Geographic's "Book of Why", written by Amy Shields, focuses on satisfying young children’s curiosity and need to know “why.” The central message of this book is to provide young readers with answers and explanations to a variety of questions many children seem to be interested in. I found this book to be very enjoyable to read and I liked it for a few different reasons.
First, the author uses different literary tools to answer commonly asked questions in a fun and exciting way. For example, throughout the text, the author puts certain words and sentences in bold to highlight the key words and important information. Along with this, the author presents the information in a variety of ways that keeps the reader interested and engaged. For example, almost every page that has a new question is written in a different layout and format. Some questions come with “did you know” bubbles, while others provide step-by-step instructions for readers to create their own experiments that go along with certain questions.
Another literary tool that the author used to convey the message was language and word choice. Throughout the book, many questions, such as “Why do seeds grow up?” usually come with in-depth explanations involving complex words that can be difficult to comprehend. The author effectively brings the language down to the level of the readers to ensure they understand the content and information presented and to ensure they stay engaged. Also, the author frequently presents the reader with questions involving the topic of discussion to give readers the opportunity to gauge their understanding and learning.
This easy to read, brightly colored informational text is extremely well written and enjoyable to read. The authors use of pictures, page layout and design, conventions, language and word choice, and opportunities for the reader to self-evaluate their learning provides young readers with an interesting and exciting way to discover answers to a variety of frequently asked questions by children. ( )

National Geographic goes through commonly asked questions form kids