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Doctoral students Toni York and Denish Akuom, alongside Dr. Steven Greenstein, recently delivered an original research talk at the .  The topic stemmed from a project led by Toni where she designed a physical tool called The Graph Tracer that enables collaborative and embodied covariational actions. The team found through an analysis of what they call “collaborative instrumented activity” that the tool helps students make meaningful connections between graphs and the covariational situations they represent, connections that research finds have been persistently difficult for students to make.