Re: Linda Coutts' remarks on the Mobius strip: rather than have them cut, first have them *predict* in groups, talk as a whole group about their predictions (giving reasons), and only then cut. (I may be stating the obvious here, in which case my apologies.)
Re: Cathy Brady's "where's the math?": If surfaces and edges aren't math, what is? If geometric reasoning isn't math (see comment in first paragraph), what is?
==================================== Judy Roitman, Mathematics Department Univ. of Kansas, Lawrence, KS 66049 firstname.lastname@example.org =====================================