Black and white version. This book explains how observations of everyday events led step by step to an understanding of how the elements, the world and the universe fit together, what they are and what that knowledge has done for us.The reader will learn answers to questions such as "How do we know how far away stars are?", "Why do we think dark matter exists?", "Why doesn't electricity leak out of sockets?", "How do we know that galaxies rotate?",...