A method of nonmetric multidimensional scaling is described which minimizes pairwise departures from monotonicity. (Author)

Discusses the reduction of the one- and three-dimensional diffusion equation to the difference equation and its stability, convergence, and heat-flow applications under different boundary conditions. Indicates the usefulness of this presentation for beginning students of physics and engineering as well as college teachers. (CC)

Results of the experiment provide support for the neo-Piagetian model. (Author)

Several examples of concrete applications of negative numbers are given. (MM)

A description of a week's work in mathematics carried out by a first year group of grammar school boys, answering the question which is the title of this article. (MM)

Several questions related to population and the use of resources are posed and discussed, with suggestions on how they might be used with students. (MNS)

The nature of the corner reflector array left on the moon by the July 1969 Apollo astronauts is described. The array was used to reflect earth-originating laser beams back to earth, and yielded a more accurate determination (to within six inches) of distance from the earth to the moon. (MP)

How a computer randomly generates numbers to turn off lighted blocks on a graphics display is discussed. A computer program is given after reviewing a definition and two theorems and applying them to the problem. (MNS)