YouTube: Finally, after what seems like eons and eons, the end is nigh. We're talking not only about the end of Crash Course Big History, but also the end of everything. The end of humanity and the end of the universe.John and Hank Green will teach you about what the future holds for humanity and the universe. Spoiler alert: in the long, long, long, long, long, long term, it doesn't look good. In the short term though, it's not too bad. But don't lose hope, there is an upside. You'll have to watch the video to find out.