All products featured here are independently selected by our editors and writers. If you buy something through links on our site, Mashable may earn an affiliate commission. Khan Academy's math lessons ...

From a tiny closet in Mountain View, Sal Khan is educating the globe for free. His 1,516 videotaped mini-lectures — on topics ranging from simple addition to vector calculus and Napoleonic campaigns — ...

Over the past decade, the free instructional website Khan Academy has transformed how tens of millions of students across the globe perceive and approach math. Now, it’s pursuing a bigger aim: ...

(CBS News) Sal Khan is a math, science, and history teacher to millions of students, yet none have ever seen his face. Khan is the voice and brains behind Khan Academy, a free online tutoring site ...

PI IN THE SKY: St Mary's School principal Tim Nelson is singing the praises of the cloud-based Khan Academy maths programme started at the Carterton school this year. With their tailor-made lessons on ...

Thirteen years ago, a Silicon Valley hedge fund analyst from Louisiana turned his talent for tutoring cousins into one of the internet’s most popular lines of free educational resources. Sal Khan’s ...