Describes an interdisciplinary investigation of air pollution in a school in which students wrote the proposals, set up experiments, analyzed their data, and formulated conclusions. (JRH)

Describes a curriculum designed around a series of investigative, macroscopic problems that enable students to learn the big picture of modern biology for themselves. Presents a hands-on investigative activity that gives students an accurate, easily grasped analogy for DNA expression. (JRH)

Presents a learning cycle lesson plan in which students investigate the question of how cells divide. Students use microscopes to explore actual plant root and stem tissues to generate and test hypotheses to answer the question. Includes teacher material, student material, and teaching tips. (MDH)

A Reuleaux triangle is constructed by drawing an arc connecting each pair of vertices of an equilateral triangle with radius equal to the side of the triangle. Investigates the application of drilling a square hole using a drill bit in the shape of a Reuleaux triangle. (MDH)

Summarizes the events leading up to and the investigation that followed the Watergate break-in. Presents a lesson plan using primary documents that allows students to explore the workings of congressional investigations, the key figures in the scandal, and the arguments of the different participants. Includes copies of the documents. (DSK)

EQUALS is a teacher education program that helps elementary and secondary educators acquire methods and materials to attract minority and female students to mathematics. It supports a problem-solving approach to mathematics which has students working in groups, uses active assessment methods, and incorporates a broad mathematics curriculum…

This unit is part of the Understanding Our Environment project that is designed to engage students in investigating specific environmental problems through concrete activities and direct experience. Students begin by researching the migratory songbirds that live in their community. They determine the bird's roles in the ecosystems and their…

Part of the Understanding Our Environment project that is designed to engage students in investigating specific environmental problems through concrete activity and direct experience, this unit contains a role-play activity in the form of a public inquiry into the cause of a fish kill on a river that runs through the fictional town of Oakwood. A…

Some number investigations on the multiplication table are provided by a sequence of four activity sheets. Beginning with examples of triangular and square numbers, the activities lead to the generalization. (MNS)

Presents a unit that focuses on landslides and integrates earth science, physics, chemistry, and math. Includes activities to investigate porosity, permeability, cohesion, saturation, and gravity. (JRH)

Studies the polarization effect on water by cations and anions. Describes an experiment to illustrate the polarization effect of sodium, lithium, calcium, and strontium ions on the water molecule in the hydration spheres of the ions. Analysis is performed by proton NMR. (MVL)

Presents two proofs that only five regular polyhedra exist. The first is a geometric proof, and the second is based on graph theory, using the relationship between the vertices, edges, and regions of the graph model. (MDH)

Presents four investigations involving geometric sequences and series: folding a sheet of paper in half 8 times, stacking pieces of paper cut in half 50 times, snapping your fingers at intervals doubled in length for 1 year, and summing time intervals continuously cut in half. (MDH)

Students explore three-dimensional properties by creating red and green wall decorations related to Christmas. Students examine why images seem to vibrate when red and green pieces are small and close together. Instructions to conduct the activity and construct 3-D glasses are given. (MDH)

Summarizes the methods and outcomes of Operation Greylord, an undercover operation that investigated the corruption of the Chicago (Illinois) court system. Shows that judges, lawyers, and police are not above and beyond the law's reach and that there are people who will take risks to ensure the existence of justice. (CMK)