This simple, nicely illustrated (cartoon-like pictures) children's book explains important concepts of science in a very easy-to-understand fashion. The reader is introduced to the way thunderclouds form and where thunder and lightning come from. The scientific content is substantial and very accessible. The story line is rounded out with tips for staying safe during a storm. My children have been fascinated by the details about the inside of a thundercloud, how fast sound and light travel, how you can measure the distance thunder travels and more. This title has been a big favorite with all of my children for a number of years and, rather than being made nervous by the dangers mentioned in the book, a little knowledge seems to be a comforting thing.