MIT + K12 is an MIT project that features MIT students explaining math and science concepts for K-12 students. The website isn't a collection of Khan Academy-style videos, it's a place where you will find videos featuring real MIT students explaining concepts while showing them as hands-on demonstrations or experiments. Watch one of the featured videos below.
Applications for Education
MIT + K12's library is fairly limited. It consists of a few dozen videos, but the concept of the MIT + K12 is promising. If you have an idea for a video, you can suggest it on the site.