This book is part of a book series called In Focus .

This book has been graded for interest at 7-11 years.

There are 64 pages in this book. This is a reference book. This book was published 2017 by Kingfisher .

Professor Charles Taylor received the U. K. 's Bragg Medal and Prize of Institutional Physics, and the UK's Michael Faraday Award for contributions to the public understanding of science. He has presented lectures on BBC television and has written many science books for children. Barbara Taylor is an experienced children's non-fiction writer. Her previous books for Watts include the Science Starters series.