Good pictures make for great presentations, I find. Sometimes, the best way to make a presentation, I think, is to let the pictures lead the way. With that in mind, check this out:
http://apod.nasa.gov/apod/archivepix.htmlWow, huh?
What I would like to encourage folks to do is divide those pictures into groups--or not--and narrate them very simply. (But accurately. And with periods at the ends of full sentences, please.)
BTW check this out
http://apod.nasa.gov/apod/ap081231.html seems like incorporating stop-action video like that, or links to it, is something we ought to be doing more of.