The first Web site related to lubrication is presented by SynLube.com and its relevant page is entitled Basics: What You Need to Know About Lubrication (1). Visitors can learn why lubrication is so important to mechanical devices, why oil needs to be changed in your car, what synthetic oils can do, and more. Although the site is for a manufacturer of synthetic oil, there is a good amount of interesting physical science information. The second site provides an educational resource activity by The Explorer, called Slippery Substances -- Lubricants (2). Students in grades 5 through 8 get to compare the "slipperiness" of various substances tested, read how a lubricant works, and identify objects that need lubricants to work correctly. All information needed to complete the activity is provided, including a short list of easily attained materials. Next, from NASA's Oil-Free Turbomachinery Program Web site, comes the High Temperature Solid Lubricant Coatings page (3). Visitors can read about a new chrome oxide based coating, which has been shown to provide good friction and wear properties to very high temperatures. The page contains descriptions, photographs, and even a link that shows the US patent for the "Self-Lubricating Composite Containing Chromium Oxide." The fourth site, About Lubrication (4), is maintained by Machine Care Systems. The page contains an informative explanation on the definition of energy release and lubricated components, and answers the questions what energy release is and if oil ever wears out. The next site, offered by the lubrication manufacturer Lubrizol, is called Lubrication Theory and Practice (5). As the title states, the site gives detailed explanations of friction reduction, lubricant viscosity, heat removal, suspension of contaminants, and other lubrication topics. InnerAuto.com offers the next site, which is an interactive animation of an Engine Lubrication System (6). As you move your mouse over the various parts of the engine, the lubrication critical part names reveal themselves and can then be clicked for additional information. If you happen to be in the market for a lubricant, the seventh site can definitely help you out. The Lubricants EZ Search (7) page, offered by ThomasRegister.com, contains 99 categories of lubricant manufacturers, descriptions of what they offer, and direct links to their Web sites. The last site related to lubricants, Lubrication Recommendations (8), is maintained by Infomedia. Here, visitors can choose from more than a dozen of machine categories and specific models to find out the type of lubrication they require as well as any notes related to that machinery such as crankcase capacity.