"How is it then the lack of extraterrestrial visitors? It is possible that there among the stars, there is an advanced species that knows we exist, but we cook in our primordial soup. But it is hard to have so many respects to a lower form of life: perhaps we worry about how many insects and earthworms under the foot? A more plausible explanation is that there is very little probability that life on other planets or developments, developed, become intelligent. Since we call ourselves intelligent, though perhaps with a little well-founded reasons, we try to consider intelligence an inevitable consequence of evolution, but it is arguable that this is so. The bacteria get along fine without us and will survive if our so-called intelligence will lead us to self-destruction in a nuclear war. [...] The future scenario does not look like the one defined by consoling STAR TREK, a universe populated by many species of humanoids with a science and technology advanced but essentially static. I think instead we will be alone and that only very, very quickly, biological complexity and electronics. "
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Stephen Hawking, The Universe in a Nutshell, Milan 2010 (original edition 2001) _______________________________________
(quoted No. 4 in the track of the first written exam of maturity, school year 2009/2010)
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