There is a rock with a core of iron in that rarest of zones in a suitable solar system. The rock unlikely as it is has a film of water on its surface and sits in a bubble of oxygen protecting it from the worst rays of its sun. This rock against the odds grew life. Of the life that grew some of the beings were sentient and some of those had opposable thumbs. Over the millennia the self aware creatures evolved, tools became more intricate and the beings shaped the world around them to there will. But for all their endeavours (like building great machines to see into the heart of the universe) a great proportion of their time is spent inventing reasons to kill one another, destroying their own planet for individual gain and masking the very nature of their feces. Their shit stinks.