Khan Academy is expanding its highest-level math content through a new partnership with a prestigious New England boarding school. The plans, announced this week, involve Khan—a popular producer of ...

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The stellar Khan Academy offers free, well-structured online courses in a variety of subjects that you'll find in US schools, and serves as a reliable source for anyone with a hunger to learn. Where ...

"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: ...