Awesome! For awhile I have been wondering how unique our civilization is considering how difficult the natural world is! With zero upcoming species to enable a second rise by another species here on earth, and zero coms from outer space, it appears nobody is GETTING ANAHILATED for having a third eye anytime soon. Sad? fact is there is only one civilization ACTUALLY known that exists today. Assumption that more than that exists is problematical for the above stated ideas. So I agree .7 is likely a reasonable number! Wow!