Sources of free pictures
Finding high-quality royalty-free photographs you can use in your film can be tricky, but it’s not impossible. This post at the Presentation Zen blog provides a terrific list of links.
We’d add Flickr to that list; there, you can search for pictures published under Creative Commons licenses, many of which you could use in your SciCast film. Anything that’s ‘Attribution’, ‘Attribution Non-commercial’ or ‘Attribution Non-commercial Share-alike’ is OK for us (the ‘no-derivs’ licenses won’t work — you’re not allowed to change the picture by, for example, cropping it to fit in your movie).
Just remember to add a note in your film’s credits explaining the source of the stills: ideally, provide a link to the page from which you snagged the image.