ScienceHack is a search engine for science videos. Every video on this site is verified by a scientist or an engineer.It focuses on many topics including physics, chemistry,mathematics and biology. If you go to YouTube to search for videos, you will get spam videos and low quality videos. ScienceHack is away from that spam. ScienceHack currently supports videos from YouTube, Google videos and Metacafe. It is currently in its alpha edition.
Sciencehack.com
Do you know any of such video sites.
Feel free to mention them in comments.
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