TED-Ed

Another great destination for more general learning and free online education is TED-Ed. From the same people that brought you the all-encompassing, motivational web series comes to a site chocked full of educational videos. Most include impressive animation, and all are ten minutes long or less.

Not only is TED-Ed an excellent site for the curious, but it also includes supplemental materials and quizzes on the videos. This makes the site extremely useful in formal education settings, as well as in entertaining ways to brush up on new discoveries and topics.