Each of the books in this series explores a different theme, using colour photographs of mystery objects from the 1900s, the 1930s and the 1960s. The reader is encouraged to look for clues in the photograph and to guess what the object is. This book looks at how being ill and getting better has changed since the 1900s. The series makes links between history and technology. The book may be used as back-up for museum visits or any work which involves the handling of artefacts. Teachers notes give suggestions for follow-up work and it includes a time line which shows the development of the objects.