From Smithsonian:
In 2004, hedge fund analyst Salman Khan began tutoring his 12-year-old cousin, Nadia, in some basic math concepts. Since he lived in Boston and she in New Orleans, they spoke by telephone, and he used Yahoo! Doodle to work through specific problems. As other family members requested his services, Khan began to post simple video lectures on YouTube. Khan realized he was on to something when strangers began leaving comments, thanking him for explaining things like systems of equations and geometry in a way that finally made sense. In 2009, Kahn quit his lucrative job to put all his efforts into Khan Academy. He founded the nonprofit with a lofty goal in mind: to provide a free, world-class education for anyone, anywhere.
Students from 234 countries and territories have logged on to Khan’s site to watch any number of his 3,400 video lectures on topics in math, science, computer science, economics and history. Teachers in some 15,000 classrooms now incorporate his lessons and software into their instruction. In his new book The One World Schoolhouse, Khan totally reimagines education. He diagnoses the problems with our century-old model for education and envisions schools that better prepare students for today’s world.
More here.