Or at least take up more of your time:
From Mashable: 10 YouTube Channels That Will Make You Smarter.
But YouTube hosts its own stable of educational channels with hundreds of videos apiece, just waiting to blow your mind. The people behind these videos are asking big questions about the universe — or doing their best to answer your burning queries. In the realms of science, math, history, law and any number of subjects you snoozed through in school, creative geniuses are making the most of the medium.