The quizzes and tutorials that carry the camera logo:

require your browser to have the QuickTime plug-in. You can download the plug-in for free by clicking on the button below:

Get QuickTime 5

Of course, there is a good chance that you already have a QuickTime plug-in on your computer, or provided by your Internet provider like AOL.

The items that carry the professor logo

are full-motion QuickTime videos. They cannot be played over the telephone line; they require a fast Internet connection.