Science360 is a great resource for Science and Math videos and news. From the description on their website:
"Science360 Knowledge Network immerses visitors in the latest wonders of science, engineering, technology and math. We gather the latest science videos provided by scientists, colleges and universities, science and engineering centers, the National Science Foundation and more. Each video is embeddable to put on your own personal websites, blogs and social networking pages. Science360 engages the general public, science junkies and students alike in the cutting-edge discoveries and big science stories of the day."
The site includes The Science of NFL Football (also hosted on NBC Learn).
Science360 News Service