This study draws upon qualitative case study to investigate the connections between the “funds of knowledge” that urban, high‐poverty students bring to science learning and the development of a sustained interest in science. We found that youth developed a sustained interest in science when: (1) their science experiences connected with how they envision their own futures; (2) learning environments supported the kinds of social relationships students valued; and (3) science activities supported students' sense of agency for enacting their views on the purpose of science. © 2006 Wiley Periodicals, Inc. J Res Sci Teach 44: 466–489, 2007

In this manuscript we examine how two students develop and express agency in and through high school physics. We tell the stories of two youth from a low-income, urban community to elucidate the important components of critical science agency in a physics context, and to situate a set of claims about how youth develop and express this concept. This research is part of a larger multiyear study of democratic practice in middleand high-school science. We present three claims: (a) that critical science agency is intimately related to the leveraging and development of identity, (b) that critical science agency involves the strategic deployment of resources , and (c) that developing critical science agency is an iterative and generative process. Two university researchers have cowritten this paper with the two students whose experiences serve as the cases under investigation, to provide both an ''emic'' perspective and student-focused voices that complement and challenge the researchers' voices.

In this rejoinder to Bryan Brown and John Reveles, we highlight the facts that (a) sociocultural theories of learning do not go far enough because they fail to address a number of issues and (b) we require concepts such as power and positionality to understand science learning.

An array of data suggests that low‐income, minority students are excluded from a high‐quality physics education. The education literature proposes that cultivating student voice in classrooms helps youth feel a deeper, more meaningful connection with school. However, limited data exist in the physics education literature on how student voice is expressed. The purpose of this study was to use critical ethnography to explore how student voice developed in the context of a ninth‐grade conceptual physics class. I developed case studies of five immigrant Caribbean youth from student, family and teacher interviews, participant observations and field notes. I relied on grounded theory as an analytic technique. Findings suggest that in expressing voice, youth designed lessons reflective of their identities, leveraged and enhanced their “epistemic” and “positional” authority (two new constructs I propose in this manuscript), and creatively utilized physics and school‐sponsored resources. This information about how students express voice has implications for how they learn physics, how critical theory is connected with physics classroom practice, and how student identity, shared authority and youth agency develop in physics classrooms. © 2008 Wiley Periodicals, Inc. J Res Sci Teach 45: 881–899, 2008

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