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1.  

   HealthiNation

   On-demand health videos delivering the latest health information you need...

   category:education

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2.  

   HGTV

   Watch great home and garden improvement videos.

   category:education

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3.  

   History Channel

   Video clips from the History Channel.

   category:education

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4.  

   HotForWords

   Strangely popular site where word etymology is taught by Marina, voted one...

   category:education

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5.  

   How Stuff Works

   Site that explains how several things work, some in video format.

   category:education

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6.  

   Howcast

   Watch informative how-to videos on everything from arts to travel.

   category:education

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7.  

   Howdini

   Tons of how-to videos in all categories with experts to help you on your...

   category:education

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2. A
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10. I
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12. K
13. L
14. M
15. N
16. O
17. P
18. Q
19. R
20. S
21. T
22. U
23. V
24. W
25. X
26. Y
27. Z