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material is copyrighted. Though partially funded by NASA, it is still a private
site. Therefore, before using our materials in any form, electronic or otherwise, you need
to ask permission.
There are two ways to browse the site: (1) use the search button above to find specific materials using keywords; or,
(2) go to specific headings like history, principles or careers at specific levels above and click on the button.
Teachers may go directly to the Teachers' Guide from the For Teachers button above or site browse as in (1) and (2).
This site is enhanced for the latest technologies on the Internet. In order to benefit from this site you will be required to use Microsoft Explorer 3.0 (or later) or Mozilla Firefox 2.0 (or later) and Macromedia's Director Shockwave Plug-In for one of the browsers. Macromedia's Shockwave enables the playback of high-impact multimedia on the World Wide Web, including live animation and sound. Real Audio's Plug -In will assist you in hearing sound as it is delivered to the computer (streaming audio) instead of waiting for the file to be completely downloaded. If you are using Firefox, you must install the NCompass Lab's Active-X Plug-In to view some of the special features of this web site.
Downloading and installing Microsoft's Explorer 3.0 (or later).
For Firefox 2.0 (or later):
Downloading and installing Download Mozilla Firefox 2.0 (or later).
Download and install Macromedia's Director Shockwave Plug-In to see the animation.
Download and install the VivoActive Player 2.0 (or later) to view videos.
Download and install Real Audio's Plug-in.
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Updated: January 31, 2007