Discusses the need to consider students' pre-existing conceptual schemes when teaching chemistry. Reports on a study done in Spain which indicates that the existence of adolescents preconceptions about gases is important to consider when teaching the principles of conservation of substance, mass, and weight. (TW)

Reports on the relationship between the seating patterns of students and their observed attitudes toward class activities in an English-as-a-Second-Language class. Discusses issues of physical territoriality, psycholinguistic territoriality, and active participation by students. (CFR)