Thread:Cdragon13/@comment-29331244-20140519134647

Couple of post that you should see.

1. http://khanacademy.wikia.com/wiki/Thread:13623

2. http://khanacademy.wikia.com/wiki/User_blog:AlexNatalieRoodman/Almost_2_weeks

3. http://khanacademy.wikia.com/wiki/Thread:13658 