内容简介：
This QandA book is inspired by a child who asked the author hundreds of 'why is." about natural phenomena and things happened around. The author scratched his head and searched for the answers, many of which are included in this book. A child's curiosity to nature and things around is his/her desire to learn. To keep him/her interested in learning more and more, one may encourage him/her asking more 'why is." and provide as many clues as possible. This is what this book is intended to help.