I love online learning, but I hate how long it takes to just watch one online lecture or course (especially slow speakers). Even watching videos at 2x speed doesn't help me, because I end up rewinding several parts or missing important points. Thus I created FocusTube. FocusTube uses computer vision to determine how attentive a user is and automatically changes video playback parameters to maximize the user's learning. It simply allows you to learn more in less time. You can try FocusTube here.