This video will blow your mind. I advise you to check out some more of SciShow’s videos because they are utterly fascinating and the one below is extremely confusing (seriously, I actually had to slow the video down to get what he was saying) but once you get what he’s talking about you’ll be like ‘oh, wow!’. It’s John Green’s (the author) brother Hank, so some of you may know him. Enjoy!
And also there is this one; this is a little easier to understand but equally interesting.