| http://www.w3.org/ns/prov#value | - For a century or so now, science fiction has been proposing that other forms of life exist in the universe and considering what will happen when mankind meets them. (Incidentally, an argument against the reality of UFOs is that before large numbers of people began imagining other life in the universe, they apparently never encountered aliens or UFOs either.) Arthur C. Clarke explored the prospec
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