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"From the Washington Post to 60 Minutes, Sal Khan has been hailed a pioneer, while everyone from gleeful journalists to investors have anointed Khan Academy a "revolution in education." It's not. Instead, Khan Academy may be one of the most dangerous phenomenon in education today. Not because of the site itself, but because of what it - or more appropriately, our obsession with it - says about how we as a nation view education, and what we've come to expect."

Refraction is an online puzzle game for teaching fractions. The game is not obviously a lesson in fractions, but requires knowledge of fractions to succeed.

A really accessible and fun site for children (and adults!) to explore and create their own art.