And crawling...on the planet's face...

Earlier this year, a group at the University of Oxford released a paper arguing that our knowledge of the universe and of math should lead us to assume that intelligent life is most probably an extremely rare event, depending on a series of fortuitous circumstances—like the weirdly large size of our moon, perhaps— that are so unlikely as to almost never happen. Humanity shouldn’t be surprised that we haven’t found aliens, because most likely there aren’t any.

(link - tldr)