Necessary programs

In order to run the java interactive contents you need to download and install the java environment (JRE). By clicking on the link on the left you can download the java environment that suits to your operation system.
http://www.java.com/en/download/manual.jsp

For another part of the interactive contents you need to install Wolfram CDF Player. Which can be downloaded by clicking on the link on left.
http://www.wolfram.com/cdf-player/

Flash animations of swf format can be viewed only if the appropriate Adobe-Flash plugin is installed for your browser.
http://get.adobe.com/flashplayer

There are also shochwave flash animations among the interactive materials can be viewed only if the appropriate Adobe-Shockwave plugin is installed for your browser.
http://get.adobe.com/shockwave

To play some of the videos we recommend to use VLC Media Player. This free and open source program is able to play a great variety of video and voice formats.
http://www.videolan.org/vlc/