http://www.youtube.com/user/NationalGeographic
http://www.youtube.com/user/DiscoveryNetworks
http://www.youtube.com/user/SmithsonianVideos
http://www.youtube.com/user/khanacademy?blend=1&ob=video-mustangbase#p/p
http://www.youtube.com/user/AMNHorg
http://www.youtube.com/user/MIT#g/p
http://www.youtube.com/user/ReelNASA
http://www.youtube.com/simplek12team
http://www.youtube.com/user/DiscoveryNetworks
http://www.youtube.com/user/SmithsonianVideos
http://www.youtube.com/user/khanacademy?blend=1&ob=video-mustangbase#p/p
http://www.youtube.com/user/AMNHorg
http://www.youtube.com/user/MIT#g/p
http://www.youtube.com/user/ReelNASA
http://www.youtube.com/simplek12team
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