Uses mirrors at varying angles and colored geometric reflections to illustrate principles of symmetry operations. Illustrates that mirror angles of pi over 2, pi over 3, and pi over 4 produce dihedral groups of order 4, 6, and 8 respectively and points out rotational subgroups. Shows how, if three mirrors with dihedral angles of pi over 3 are set perpendicular to a plane, a true kaleidoscope is formed by each pair of angles. Concludes with a series of colored illustrations of tessellation.
All organisms tend to maintain their organization in spite of changing environmental conditions. Dr. Roney describes the different types of responses which organisms make to stimuli. Using the micro-projector, he shows a number of simple organism responses. He also shows the beating heart muscle in a live chick embryo.
Discusses and illustrates the size, shape, composition, and organization of a living cell, and, with the use of a model and a simplified drawing, shows the different parts. Points out a few of the differences between a plant and an animal cell. (KUHT) Film.
Wind, heat, cold, and rain combine to weather the rocks and break them down. But the face of our earth is molded and the decayed rock carried away from one place and deposited in another mainly by water. The deposits laid down by water, wind, or ice produce after long periods of time and under pressure, rocks which are classed as sedimentary. You will see and learn how to distinguish some of the common sedimentary rocks; limestone, sandstone, shale, and conglomerate. Each of these sedimentary rocks is formed in a different way; limestone by chemical precipitations, sandstone by grains of sand cemented together, shale from beds of mud or clay pressed and cemented into thin layers, and conglomerate is made of gravel or pebbles of assorted sizes cemented together. You will be introduced to one of the most interesting features of sedimentary rocks -their fossils. These records of living things are guides to the history of life on the earth.
Depicts the events and conditions leading to the writing of the U.S. Constitution, the formulation of the Great Compromise between the small and large states, the struggle for ratification, and the addition of the Bill of Rights. For junior high, high school, and college students. Pictures some of the historical background of the struggle by the colonies for independence and of the signing of the Constitution. Includes Shay's rebellion against the tariff, the weaknesses of the Articles of Confederation, and the disagreements among states. Shows how the misunderstanding between large and small states led to the establishment of a House and a Senate.
Presents, through animation, an overview of the dinosaur age, showing the major types of dinosaurs and some of their behavioral characteristics. Explains that dinosaurs become extinct because of their inability to catch food. Records how some dinosaurs changed their eating and living habits to adapt to the changing surface of the earth.
It's Christmas Eve and Santa hasn't come yet, so Buffalo Bob Smith, Howdy, and Clarabell The Clown (Bob Keeshan soon-to-be "Captain Kangaroo") decide to take the Rocket Doodle as transportation and head for the North Pole to see what's happened to Santa. When they get there they find out that "Ugly Sam" (Dayton Allen later of "The Steve Allen Show") thinks that Santa is the "Bearded Bandit" and has captured him. So, it's up to Howdy and the Crew to prove differently.
Follows the activities of a group of international Girl Scouts at a wilderness encampment in an Oregon national forest. Shows how they prepare for and take a five-day hike into the Three Sisters' Wilderness Area of Oregon without adult leaders. Quotations from their evaluation session are heard.