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Investigates the digestive consequences when a family sits down to lunch. As the first morsel is put into the mouth, the camera watches from inside as the molars clamp down and the process of breakdown and transformation occurs. Follows the food through the entire alimentary tract, showing how it is dissolved in acid, how the liver and gallbladder work, and how digestion and absorption work.
(Source: DCMP)
Using real-world demonstrations and colorful graphics, students explore how light travels and how different mediums can affect light, resulting in reflection, refraction, and absorption. The color spectrum is also discussed through the use of prisms and paints. Part of the "Real World Science" series.
These days it seems everything is going green including roofs. With funding from the National Science Foundation, Patricia Culligan of Columbia University is studying green roofs, from their effects on storm water runoff and carbon dioxide absorption to claims they impact local climate and save energy.
Argentina is experiencing a decrease in native forests due to deforestation. As part of the process, only fifteen trees are replaced for every hundred cut down. This depletion of natural vegetation has devastating consequences for the environment. These consequences are immediate and long-term, if not reversed. Deforestation affects climate, biodiversity, conservation, and water absorption. Chapter 5 of Air: Climate Change Series.
Human ancestors in Africa likely had dark skin, which is produced by an abundance of the pigment eumelanin in skin cells. In the high ultraviolet (UV) environment of sub-Saharan Africa, darker skin offers protection from the damaging effects of UV radiation. Dr. Jablonski explains that the variation in skin color that evolved since human ancestors migrated out of Africa can be explained by the tradeoff between protection from UV and the need for some UV absorption for the production of vitamin D.
What does a mirror tell us about light? Illustrates 11 computer-animated video units for one aspect of light's behavior-reflection. Euclid's geometric optics and his findings on the perception of distance and perspective lead to a discussion of the Law of Reflection, linking angle of incidence with angle of reflection, and the concepts of absorption, transmission, and diffuse reflection. Explains the principles involved with plane, concave, and convex mirrors, including vertex, principle axis, center of curvature, radius of curvature, and virtual image. Shows a group of "mirror equations" how an object's location can be determined by using the laws of reflection.
