(Photograph) - Pupils at La Salette Catholic primary, Rainham, Essex, are happy playing together, but not all playgrounds are so harmonious. The British Educational Research Association conference was this week discussing boys’ behaviour in the playground. A Loughborough university study of children in 10 primary schools found that boys who want to prove their masculinity carve out territory from which girls and less physically able boys are excluded. Photograph by NEIL TURNER