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http://www.watchknow.org/

WatchKnow has indexed over 15,000 online educational videos for children, putting them into a directory of over 3,000 categories.
The videos are available without any registration or fees to teachers in the classroom and to students at home 24/7.
You can dive into our innovative directory or search by subject and age level.
Video titles, descriptions, age level information, and ratings are all edited for usefulness. ...