This book is part of a book series called Everything You Need To Know .

This book has been graded for interest at 5-9 years.

This is a reference book. This book was published 2007 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.