You've probably seen Dr, Neil DeGrasse on TV explaining some sort of science. He is one of the "go to" guys when a TV show needs science explained in layman's terms.  In this video Dr. DeGrasse explains why Earth and Human's are "special". It's not why you'd expect. We are special because we aren't. I won't try to explain it, I'll let him do that, but take 12 minutes today and watch this video and let your mind be blown.