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Author of the classic "2001: A Space Odyssey", Clarke was one of the great thinkers who brought much of what was science fiction into what is now science fact.
Clarke was the first to suggest geo-stationary satellites - which are now in everyday use for communications and television, while research continues on his idea of a "space elevator" which would make costly rocket launches obsolete.
Scores game points for Robert Hart (who chooses Nelson Mandela as a replacement), Ninjabader and Pieboy32.
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