Video duration: 996 seconds
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This is a prototype easy to build rooftop forced air heater that produces 45 degree increases at a high CFM CFPM rate. This one is made out of cardboard. A real one can be made out of weather proof material.
http://www.greenp owerscience.com/
Video duration: 362 seconds
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Find out where humanity has been in space in the 50 years since Sputnik. Produced using Celestia.
More: http://space.newscie ntist.com/channel/sp ace-tech/sputnik-leg acy