What a brillant person he is. In order to see the world as it is and the ifs, really brings out the notion that there are many possiblities. Steven Hawkins on the other hand sounds a little koo-koo compare to Kaku. What is Kaku is right on the basic that there is a league of space justice who looks over the universe and wont allow any aliens to set foot on earth. They are working behind the scene with us seeing them. Think about it.