Five sets of activities for students are included in this document. Each is designed for use in junior high and secondary school mathematics instruction. The first "Note" concerns magic squares in which the numbers in every row, column, and diagonal add up to the same sum. An etching by Albrecht Durer is presented, with four questions followed by activities on rotations and reflections with magic squares, the Lo-Shu magic square, building a magic square, diabolic squares, and a magic cube. Challenge problems are also included. The other "Notes," structured similarly with a variety of activities, concern: Random Walks; Probability: Quantifying Change; Tessellations; Patterns in Geometry; and Correlation: What Makes a Perfect Pair? Solutions are included. (MNS)