Found this video on the IBM Website...a lot of it applies to Computer Science. It's the Wild Duck video Zip ahead to minute 7 and there is a great 2.5 minute clip about a researcher using the data collected from computers in the NICU to help premie health.
So, why this particular video?
Part of our job is to show computer science in context. Showing that computer science is about more than games, but about using computation to solve real human problems helps attract a variety of kids to our classes.
While you are at it, the 100x100 video is the history of IBM's first 100 years, but is a good history of computers video also.