The Fermi Paradox. Assume other life. ... Why no contact? So please give your opinion. Maybe we already had contact but .... ????
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All those Q's and more are addressed at this link - http://www.businessinsider.com/climate-change-grea...
"The mass extinction we are now living through has only just begun; so much more dying is coming."
Yes, it addresses some, and basically says similar things: there may be a "Great Filter" of sorts preventing communication with potentially intelligent life. Definitely an interesting subject.
I also thought that the gray aliens are humans from the future coming 'back in time' to fix something. Also, if any number over infinity = zero, then technically - we don't exist. (and HP is a dream?) Who is dreaming? :)