Academic Earth, a social venture focused on expanding the availability of educational opportunities for people around the globe, announced the launch of its new website. Academic Earth offers free access to online video of full courses and guest lectures from leading educational institutions including Yale, Harvard, and MIT. The catalog of video lectures contains 60 full courses and 2,395 overall lectures, for a total of more than 1,300 hours of educational video content. The lectures are presented through an interface that allows visitors to browse by subject, university, or instructor. The site also includes guest lectures on leadership, business, and policy. The company will integrate a variety of tools such as an A-F grading system that allows users to rate the quality of each lecture, a Q&A system, which will allow visitors to ask questions about a video to be answered by other users.