Site recounts how X-rays were discovered as well as who discovered them. Offers graphics, links to facts on this topic, a quiz, and teacher resources.

Many International countries are challenging the belief that the Internet was born in the USA. This thorough list of links pulls together ongoing research, publications and articles supporting the theory that Internet was collaboratively...

Just what is a goiter, and what causes it? Two physicians explain on this page which gives general information about the treatment of goiters.

This article defines the basis of wind-driven circulation, including the Ekman spiral and transports.

[Free Registration/Login may be required to access all resource tools.] Considers the reflection of light from both smooth and rough surfaces and the law of reflection.

In this 7-question quiz, students are asked to create an image of a tennis ball with the lighting condition shown in the image. Adjust light properties to match the image.

A collection of video lectures from a VLSI design course taught at the National Programme on Technology Enhanced Learning. The course focuses on design, verification, and test with forty lectures. Topics covered include bipolar junction...

A video animation showing how oxygen is brought to the cells in the body. Follow the oxygen as it is taken in by the lungs as gas and then transformed into solution and carried by hemoglobin throughout the body. Also learn how oxygen...

A video showing an animation of how carbon dioxide is exchanged from tissues to the lungs. Understand how an enzyme catalyzes the diffusion and breakdown of carbon dioxide in the red blood cells and lungs to have allowed it to be...

Find eleven lesson plans developed in conjunction with the PBS documentary "The New Americans," which explores what it means to be a new Americans in the twenty-first century. Lessons touch on topics associated with recently arrived...

College-level chemical engineering course highlighting the general principles of separation by equilibrium and rate processes. Course topics comprise staged cascades and applications to distillation, absorption, adsorption, and membrane...

A collection of video lectures from a course that investigates the application of basic chemistry principals to engineering systems. The course draws from industrial practice to give examples of the application in engineering systems. In...

This site from ScienceWorld gives a brief description of Brownian motion. It also goes on with a detailed series of formula derivations utilizing calculus. Links to related topics and definitions are given.

The Stanford Center for Latin American Studies provides information, multimedia resources, and activities relating to the art and history of the Garinagu, or Garifuna, people of Honduras.

This resource is an article about the cell membrane, and its role in water and solute movement in and out of the cell.

Diagrams and animations help you understand the basics of cell membrane structure and function.

[Free Registration/Login Required] The story of the Columbian exchange is a story of two worlds colliding. The Europeans brought horses and wheat, they also brought germs. Here's a synopsis of the effects of that fateful encounter.

This quick reference page explains the different types of passive transport in cells.

In this activity, you can observe how ocean acidification can have big consequences. This activity has students creating a cup that has a carbon dioxide-rich atmosphere that allows them to watch how the water changes beneath the atmosphere.

Two learning games, created by visitors to What2Learn, provide a fun way to learn how cells transport molecules.

[Free Registration/Login may be required to access all resource tools.] Introduction to active transport.

[Free Registration/Login may be required to access all resource tools.] Describes osmosis.

[Free Registration/Login may be required to access all resource tools.] Discusses the habitat, motility, nutrition, and reproduction of protists.

This site has complete information about the U.S.-Mexico border. It has an interactive timeline of important border events and a morphing map that shows changes in the border.