"Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also [tangent=What the frick?]partnered with institutions like NASA[/tangent], The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content."
Does Khan Academy need an introduction? Personally, it's this website and its founder Sal Khan that made me fall in love with learning again. I also wrote something about him on Quora, and it went viral with 2 million views: qr.ae/TUhRWz
“It is not knowledge, but the act of learning, not possession but the act of getting there, which grants the greatest enjoyment.” —Carl Friedrich Gauss
"If teaching is reduced to mere data transmission, if there is no sharing of excitement and wonder, if teachers themselves are passive recipients of information and not creators of new ideas, what hope is there for their students?" —Paul Lockhart, A Mathematician's Lament: www.maa.org/external_archive/devlin/LockhartsLament.pdf