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Students traverse new mathematical territory as they imagine life in a two-dimensional universe.

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The goal of the “Problem Solvers” department is to foster improved communication among teachers by posing one problem each month for teachers of grades K–6 to try with their students. Every teacher can become an author: Pose the problem to your students, reflect on your students' work, analyze the classroom dialogue, and submit the resulting insights to this department. Through contributions to the journal every teacher can help us all better understand children's capabilities and thinking about mathematics. Remember that even students' misconceptions provide valuable information.

Why do we have copyright law? Although there have been various laws throughout history designed to regulate publishing, modern copyright law has its clearest roots in the Statute of Anne, established in England in 1709. This act of Parliament was intended to stop “Printers, Booksellers,...