Franklyn M. Branley was the originator of the Let's-Read-and-Find-Out Science series and the author of close to 150 popular books about scientific topics for young readers of all ages. He was Astronomer Emeritus and former Chairman of the American Museum of Natural History-Hayden Planetarium.
There is a ton of information in this book, making it one of the more advanced titles in the Let's Read and Find Out series. For me the most useful parts of the book are the experiments, which seem like they would be easy to accomplish in our homeschool and would add some new dimensions to our usual project of planting a seed in a plastic baggie.