Science+Videos

http://www.neok12.com/ http://pbskids.org/scigirls/video http://thehappyscientist.com/science-videos http://sciencenetlinks.com/collections/ http://shapeoflife.org/download-library [|Powers of Ten™ (1977) - YouTube]

http://www.bbc.co.uk/news/science-environment-22364761 Passing Gases: Effusion, Diffusion and the Velocity of a Gas https://www.youtube.com/watch?v=TLRZAFU_9Kg