Teachers can play critical roles in challenging or reinscribing dominant narratives about what counts as STEM, who is seen within STEM disciplines, and how these disciplines should be taught. However, teachers have often experienced STEM in limited ways in their own education and are thereby provided with few resources for re-imagining these…

Deictic linking gestures, hand and arm motions that physically embody links being communicated between two or more objects in the shared communicative environment, are explored in a cross-cultural sample of mathematics instruction. Linking gestures are specifically examined here when they occur in the context of communicative analogies designed to…

To conceive the infinity of integers, one has to realize: (a) the unending possibility of increasing/decreasing numbers (potential infinity), (b) that the cardinality of the set of numbers is greater than that of any finite set (actual infinity), and (c) that the leap from a finite to an infinite set is itself infinite (immeasurable gap). Three…

Summary Street is educational software based on latent semantic analysis (LSA), a computer method for representing the content of texts. The classroom trial described here demonstrates the power of LSA to support an educational goal by providing automatic feedback on the content of students' summaries. Summary Street provides this feedback in an…

Activity structures such as classroom lessons and initiation-reply-evaluation sequences are important cultural tools that help students and teachers accomplish everyday activity, but they are not well adapted to open-ended inquiry conducted by students in small groups with teacher guidance. In this research, I identified alternative activity…