Find out about machines / Malcolm Andrew -- Fire / Jenny Hodgson -- Grow your own / Pam Nicholson -- Keeping going / Gerry Confield -- Machines on the move / Malcolm Andrews -- Pollution / Ernest J. Palmer -- Safe eating / Jenny Hodgson -- Science at home / John Morris -- Starting and shopping / Gerry Confield -- Structures / Christopher Jones -- Teacher's guide / Leon Darrall