My frequent co-debater Juhan Harju has just posted a link to an about
one hour online public information lecture about vitamin D by
professor Reinhold Vieth from Toronto university. Very good, well
presented, and easy to understand lecture, which should interest also
cancer patients. Professor Vieth is one of the hot names in vitamin D
research and has on a few occassion posted to usenet newsgroups, and
seems to follow them now and then. Once we exhanged a couple of
emails, when he contacted me to congratulate me for my vitamin D
postings and inquired about my background. The lecture is available at
the url.

http://www.direct-ms.org/presentations.html

It works well in IE, but if you use Firefox, you may get an error
message

   Cannot create directshow player

If that happens, you may have to reinstall Windows Media Player to get
the lecture work in Firefox. There is discussion about this error in
the thread

npdsplay error - MozillaZine Forums
http://forums.mozillazine.org/viewtopic.php?t=297172

where the solution is also suggested.