An in-depth discussion on reflection of light can be found here. Among the topics discussed include are the difference between specular and diffuse reflection, concave and convex mirrors, facets, total internal reflection, and much more. Also provided are some interactive Java tutorials on reflection of light.

This site discusses primary lighting sources and gives information on the different properties and spectral characteristics of each. Also includes links to some interactive Java applets.

This video segment adapted from Shedding Light on Science demonstrates the law of reflection, showing how light energy is reflected off both smooth and rough surfaces at predictable angles. Includes background reading material and discussion questions. [5:36]

In this lesson, students will be introduced to the geologic time scale and a brief history of geologic time.

Ian and his family are on holiday near Loch Ness. Find out about the Loch Ness monster, and learn about light and reflection.

In this video, students learn how the invention of velcro was inspired by the burrs that got stuck to a dog's fur. Includes background reading and teacher tips. [2:00]

Two thousand years before today's "global economy," an exchange network linked the continent of Asia via the Silk Route. Between the first and eighth centuries of the common era, the empires and states of Asia often came into conflict as they competed for territory and other resources or sought to dominate their neighbors in religious and political arenas. Yet the sea and overland routes between China and the eastern Mediterranean-the Silk Route, or Silk Road-also fostered peaceful interaction, both cultural and commercial. Merchants, ambassadors, and pilgrims transported crafted goods and raw materials acquired from distant realms: spices, precious metals, musical instruments, rare medicinal herbs, objects used in worship and ritual. Silk, the most famous of these long-distance luxuries, reached southwest Asia by the first century B.C.E. from production centers in China.

Makers & Shakers is a blended-learning workshop for teachers and administrators about
classroom ‘making’ – everything from science-oriented circuits and inventions
to the how-tos of 3D printing.

What were the causes and effects of westward expansion between 1844 and 1877? Kim discusses how economic opportunities, government support, and the idea of 'manifest destiny' brought migrants to the western United States. [8:38]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Click on the sliding bar and watch how the United States territory grew with the Louisiana Purchase, Florida Acquisitions, Texas Annexation, Oregon Country, and Mexican Cession.

Martin Luther King Jr. left the famous march from Selma to Montgomery to come to Cleveland. Why? To encourage voter registration as a way for black people to let their voices be heard. Support materials are provided. [2:47]

Presentation of an emerging theory that explains the mass extinction of life that occurred at the end of the Permian period. [4:51]

This lesson gives a mathematical interpretation of static friction. It is 1 of 2 in the series titled "Mathematical Interpretation of Static Friction." [8:44]

Learn all about the ear and how it works in this illustrated article on the anatomy and function of the ear.

In this lesson, students will be introduced to physical and geographic features of the Great Lakes, including the size, area, amount of water, and locations of each, as well as the significance of the Great Lakes to many aspects of life for the region in which they are located.

Meet Carlos at his Mexican diner, and he will tell all about energy and energy transformations.

Here is a presentation of Coulomb's Law and the electric field potential formula, with example problems.

Defines electric potential, field lines, and equipotential lines. Contains example problems and formulas for solving.

Scientists classify minerals based on a set of physical properties. Each of these properties is described in detail.