Started by The Fault in Our Stars author John Green and his brother Hank, YouTube’s CrashCrouse channel gives nearly 7M subscribers a series of informative videos on philosophy, physics, history, game theory, technology, mythology, literature, and just about any other subject you can imagine. With over 1.6M new subscribers in 2017, John, Hank, and friends find new topics to add as they go, expanding their roughly ten-minute lessons to include subject like sociology, computer sciences, study skills, and film theory this year. There are a lot of complicated ideas out there, but CrashCourse’s incredible lineup of presenters and producers make them understandable and easy to digest.