Dr. Mike Goldsmith studied the philosophy of time and space at Keele University in the UK, where he also obtained his PhD in astrophysics. He was formerly the Head of Acoustics at the UK's National Physical Laboratory and is now an author of non-fiction books for children. Barbara Taylor has written numerous children's books on science and natural history topics, including several titles in Kingfisher's highly acclaimed I Wonder Why and Discover Science series. She has won numerous awards including the American Association of Physics Science Writing Award and the Geographical Association Gold Award. She lives in Tunbridge Wells, in Kent, UK.