In this talk, I will introduce ongoing design-research projects that attempt to further stretch students' knowledge building in classrooms to connect more deeply with the public. Overall, I posit that with proper pedagogical and socio-technical conditions learners are capable of meaningfully participating in public discourse while advancing curricular goals. In particular, I will introduce computer-supported collaborative learning (CSCL) environments we designed to support ninth graders to study "Energy and Matter" in connection with the "Green New Deal" in the United States; I will also showcase computational research conducted by sixth graders in relation to the United Nations Sustainability Development Goals. Alongside the explication of the design principles and designed environments, I will share episodes of students' knowledge building and evidence of their knowledge advancement, expressiveness, and higher-order competencies. In doing so, I hope to challenge our entrenched beliefs about learner capabilities and highlight the potential of nurturing conditions in K-12 classrooms for knowledge building that connects with and contributes to the public good.
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