from Sal Khan, Founder, Khan Academy at Gel 2010, 29th-30th April 2010
Added 2 years ago
from Matt Haughey, founder of Metafilter.com at Gel 2010, 29th-30th April 2010
United States United States, New York
29th–30th April 2010
Gel
Most recent added 2 years ago
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