Helpful 
          links
        If you have trouble accessing this issue's bonus materials, check the 
          most common sources of problems below.
        Strength of your internet connection: Video and audio 
          files are significantly larger than a basic HTML file. A broadband connection 
          is recommended to facilitate quick loading of pages, images, and bonus 
          material. If you are a dial-up user, it will result in slower download 
          time of pages, so please be patient.
        Browser version: Make sure you have updated your web 
          browser to the most current version. Many plugins needed to view files 
          such as this issue's bonus material are automatically included with 
          the newest browser versions. You may only need to install a current 
          browser and revisit the bonus pages.
          Internet 
          Explorer
          Netscape 
          Navigator
          Safari 
          for Macintosh users
        Plug-ins/support applications: Free software is available 
          for download through the following links:
          Both RealPlayer 
          and/or Quicktime 
          (Mac)  will play the video and audio files in this special issue 
          if your browser is not launching appropriate applications automatically. 
          Audio files (MP3s) can also be played in iTunes 
          for both Mac and PC.