can I get your best educational youtube/ online videos/ lectures??

[Peek a Boo]

we've been watching these [below], and after watching the homeschooling diagramming videos, i was thinking it would be cool to collect some fun and educational videos into one thread. So if you come across a video that can help in any subject, post it here!

thanks :)

http://www.youtube.com/profile_videos?user=bubblebear83&search_query=eureka

http://www.freesciencelectures.com/

[St. Theophan Academy]

you mean youtube can be educational :) ??????