When you compare the expense of buying and downloading a stock clip to the expense of the production hiring a camera crew to shoot a similar shot, you will soon realize the considerable amount of money saved. As far as time to film, travel, etc. you soon see the amount of time saved as well.
Posts
http://www.nasa.gov/multimedia/index.html
Though, if you've already looked there, I don't know what to tell you.
Thanks.
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