Khan Academy: Friend or Foe?
A Principal's Reflections
APRIL 23, 2012
To date, these statistics are: 140 million+ lessons delivered, 500 million+ exercises done, and 6+ million unique visits per month. In addition to using Yahoo doodle, he began writing quiz software in 2006. Dismissive at first, he then began to create video tutorials that were uploaded to YouTube.
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