In Fall/Winter 2021/22, the Paderborn Math Circle will meet online/virtually with BigBlueButton on Saturdays October 23, 2021, November 2021, and January 22, 2022, from 10:00 am to 1:00 pm. Interested students who are familiar with middle school math and who enjoy logical thinking are most welcome to participate. The exciting topics for the Fall/Winter 2021/22 Math Circle meetings are "Magic Squares," "Pentominos and Similar Puzzles," and "Curves and Surfaces in the Plane." More detailed information can be found at: https://math.upb.de/mathezirkel