Not only do I think this 20 minute educational video is interesting to watch, but I love that they offered it for free on their website and posted it to YouTube. Schoolteachers just started pulling it for free and using it as part of their curriculum. It became a huge hit and reached a massive audience because they chose to make it easy to access. Youtube link below the image. 
http://www.youtube.com/watch?v=gLBE5QAYXp8&feature=fvst
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