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Re:Stephen Hawking and Yuri Milner Announce $100M Initiative... by ekianjo on Monday July 20, 2015 @11:56AM (#9916878)
> For me the best explanation is the size of the Universe

Size, and time of the Universe. Most probably species do not last beyond a couple of million years no matter what, and there may be very little overlap between periods of intelligence even if they were in relatively close area of space.

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