Khan
Academy is
unbelievable, Bill
Gates said in
2010. The online trove of more than 3,800 education how-tos was ported to the
smart phone world early last year.
Users
can browse 10- to 15-minute videos showing creator Salman Khan and others doodling away on a digital black
board to explain subjects from making hexaflexagons to the stereochemistry of
dienophile.
Khan
Academy also features new videos that help explain issues the world faces today
– like a four-part series on the Greek debt crisis or the introduction to the US social
security system.
Khan
Academy’s videos hosted on YouTube have received more than 200 million hits.
