This paper presents the results of a study conducted with second grade students and pre-service teachers. This study examined the possibilities for engaging children in critical discourse about their classroom science experiences. At the heart of this discussion lies the desire to provide a space for teachers and children to develop relationships and to explore the learning of science together. Themes that emerged include: (1) on-going, focused, critical dialogue between children and teachers supported children in developing agency in the classroom, and (2) on-going conversations created the opportunity for children to reveal their ways of knowing and developing interpretations of the practice of science.