[caption id="attachment_99252" align="alignleft" width="100"] Sal Khan's nonprofit now contains more than 3,100 free video tutorials, mostly on math and science—but the site has begun expanding its scope to other subjects, too.[/caption]

Sal Khan, whose online Khan Academy serves up video tutorials to more than 6 million students worldwide each month, wants to reassure teachers that the free educational service isn’t out to take their jobs—nor is it a statement about a teacher’s ability to deliver a lesson effectively.

On the contrary, Khan said, teachers who are using the service with...

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