This is a video from CGP Grey. If you’re a fan of TodayIFoundOut, I guarantee you’re going to love his YouTube channel, unless you just hate videos that is. (He also has a good podcast, Hello Internet, with fellow famous YouTuber Brady Haran.)

Also, don’t forget to check out TodayIFoundOut’s YouTube channel here, which very soon will start being updated weekly as our video person switches to doing this full time instead of almost never-time.