Lecture notes are available for download as Adobe PDF files, which can then be viewed using Adobe Acrobat, or printed.
To view the files within your browser, if you have the Adobe Acrobat plugin for your browsers, just click on the links.
To download the files:
If you need the free Adobe Acrobat plugin, visit their site.
If you want to see the video on the "experiment from the Leaning Tower" that is attributed to Galileo, download the Quicktime Video to your computer and play it in Quicktime.
The description of "rolling motion" for the example of interstellar pickup ions (which happen to move in the same way as the valve on a bicycle wheel) can be found on the Interstellar Learning Page together with a video animation of the process.