I can't believe such a fantastic smart (GENIOUS) person like Bryan Greene would think that in a Universe so Vast that we know so little about  and haven't explore at all! We might be alone 🤦🏻‍♂️ even smart people can be dumb at times! 🤷🏻‍♂️ finding another civilitation in the universe  is like dropping a needle in a beach around the world and telling someone to find it.,(reply>), WE HAVE NO PROOF OF ALIENS !!  NOT EVEN LIFE OF THE EARTH !!