Most of the earning objects have sound and animation.
The learning objects require the following browser plug-ins:
1. SVG Adobe SVG Viewer Plug-in
http://www.adobe.com/svg/
2. PDF Adobe Acrobat Reader 5
http://www.adobe.com/products/acrobat/readstep.html
3. Flash MX Macromedia Flash Player 6
http://www.macromedia.com/support/flash/ts/documents/oldplayers.htm
4. Shockwave Macromedia Shockwave Player 8.5
http://www.macromedia.com/shockwave/download/alternates/#sp
5. Java applets Java for Windows
http://java.sun.com/getjava/