Considered is the open-ended question of the various means of marking an n-inch ruler so that the distance of any integral number of inches from 1 to n can be ascertained with a single measurement. The relationship between a sparsely marked ruler, which is one gracefully marked with the fewest number of marks, and specific discrete graphs is…

Discussed is how a high school physics class designed and built a human-powered hovercraft. (KR)

An activity in which students compare the sun's brightness with that of a light bulb of known luminosity (in watts) to determine the luminosity of the sun is presented. As an extension, the luminosity value that the student obtains for the sun can also be used to estimate the sun's surface temperature. (KR)

An activity in which students practice vector addition and interact with every other student in class is described. Directions for playing the game and a copy of the vector name tag needed to play the game are included. (KR)

Two computer-generated star charts that can be used as overlay transparencies to show an expanding universe are presented. Directions on how to use the star charts to determine the Hubble constant and the age of the universe are provided. (KR)

The effect of background color on the perception of color by students is discussed. Explanations on why students only see certain colors when viewing colored marks on a blackboard through different color filters are provided. (KR)

Described is a situation where students are allowed to enlist the aid of a computer graphing program to produce graphs for their lab reports. (KR)

Two inquiry-based teaching activities that are structured to cause cognitive disequilibrium and enable the student to alleviate the disequilibrium with the resultant equilibration at a higher cognitive level are presented. The first activity uses a Cartesian diver and the second a short film in which students are asked to determine the main idea…

Suggests math activities for elementary students that are designed to strengthen problem-solving, computation, and calculator skills by revolving around the real-life situation of a picnic. The article suggests designing a class project to plan and carry out a class picnic, stressing the use of mathematics and calculators. (SM)

Presented are five scenarios of how division might be introduced to a class of third graders using experiences with the concept, process, and symbolism of division rather than algorithms. Instruction that makes problem solving the emphasis of students' learning is described. (KR)

A static method of measuring the surface tension of a liquid is presented. Jaeger's method is modified by replacing the pressure source with a variable pressure head. By using this method, stationary air bubbles are obtained thus resulting in controllable external parameters. (Author/KR)

Using a physical picture, an expression for the maximum possible transverse velocity and orientation required for that by a linear emitter in special theory of relativity has been derived. A differential calculus method is also used to derive the expression. (Author/KR)

These two learning activities provide context, objectives, list of materials, student activity, and evaluation criteria. The first involves an automotive class in developing a model alternative fueled vehicle, and the second involves the design of a useful recyclable product. (JOW)

Describes the use of a weekly blackboard session as a way to improve instruction in an organic chemistry lecture. The instructor writes problems on the board and either alone or in groups, students write the answers on the board. Later, they explain their solutions to the class. (PR)

Presents an activity on transformations that employs a story from children's literature. Emphasizes that books and stories that use mathematical problem solving not only engage children in the narrative but also give them opportunities to see how mathematics is used in everyday life. (ASK)