(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 ...

Whether you’re trying to teach a young kid how to count or struggling through an advanced college math class, there are several apps that can make math less painful. This list focuses on iOS math apps ...

"If I'm down three with 30 seconds left, is it better to take the three or easier to take the two and attempt to foul a bad free-throw shooter and get another possession?" This is just one of eight ...

Where should you go online to advance your understanding of a topic or study something new? For academic subjects, start with the excellent Khan Academy. It's one of the best online learning services, ...

"This," says Matthew Carpenter, "is my favorite exercise." I peer over his shoulder at his laptop screen to see the math problem the fifth grader is pondering. It's an inverse trigonometric function: ...

A big idea driving Khan Academy is a belief in “mastery learning”—that students should show proficiency in one set of materials before moving on to the next. The nonprofit’s latest push to make ...

Opinions expressed by Entrepreneur contributors are their own. This may surprise you, but Sal Khan used to skip classes at MIT. They were too long and boring, he often thought, particularly lectures. ...