@salkhanacademy my son is ahead in math in his 3rd grade class and his teacher set him up with @khanacademy thank you for your work!
New videos from @salkhanacademy about pension obligations and the challenges for the states, especially Illinois:http://www.khanacademy.org/about/blog/post/36815487104/illinois-pension-obligations …
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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@khanacademy@salkhanacademy 60+ celebrities took an action to save the earth! 'If Love Earth, take Action'http://www.youtube.com/watch?v=Z3tLf3FNftc …Thanks. Twitter will use this to make your timeline better. UndoUndo
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