You should familiarize yourself PBS Digital Studios. They have several high quality Youtube channels. CrashCourse, Space Time, Infinite, etc. are much better at

You should familiarize yourself PBS Digital Studios. They have several high quality Youtube channels. CrashCourse, Space Time, Infinite, etc. are much better at using the Internet medium and specifically video for learning than Khan Academy, with high production values for a Youtube series though they have different objectives. Khan Academy is like a traditional classroom via the web. The PBS shows are bingeworthy. Seriously, take a look at SpaceTime. It's so much better than anything the Science or Discovery channel puts on. And I've binged on several topics in Crash Course