Science occupies a powerful place in schools and societies more generally. But what are the boundaries of science and how should it be represented in schools? Michael Reiss's inaugural professorial lecture at the Institute of Education, University of London addresses these questions. He argues that there is a need to develop science curricula and teaching approaches to broaden what is commonly taught in school science. Such a move makes intellectual sense, is what pupils want and is feasible. It should lead to science teaching being more satisfying for pupils and science teachers alike.