Describes two sets of activities designed to stimulate thinking skills and to bring some topological aspects into the mathematics curriculum. One set explores Mobius strips; the other set deals with tori. The activities are suitable for students in fourth through eighth grades. (JN)

Permanent models of soap bubble configuration can be made by using a new plastic art medium. (MM)

The author's experience in leading activities related to the Mobius strip to a fourth-grade class is discussed. (SD)

The letters of the alphabet can be classified according to their geometric and topological characteristics on these worksheets. An additional worksheet provides for tallying the frequency of usage of the letters in three sentences. (SD)