The topic of altruistic behavior is an important one in studying the evolution of behavior. It is questioned whether natural selection can actually favor patterns of behavior that apparently do not favor the survival of the individual. Game theory models are presented to help explore the problem. (MA)

Discusses some theorems and properties of figures produced when circles are tangent to one another. (GA)

Presents a mathematical game called the dinner-guest problem that deals with Steiner triple systems. (HM)

Discusses some mathematical games concerning the packing of squares. (HM)

Discusses areas where minimal sculpture and geometrical play overlap. (GA)

This familiar card game has interested mathematicians, economists, and psychologists as a model of decision-making in the real world. It is now serving as a vehicle for investigations in computer science. (Author/MA)

Describes and illustrates the structure of different versions of Mobius bands called prismatic rings or twisted prisms. Different forms are mentioned, such as the one bent into circular shapes and the toroidal polyhedrons. (GA)