Clarke was an amazing force in shaping scientific thought (and action), not just through his fiction but through his non-fiction writing and personal appearances.
One section from the book really strummed a sour chord in me, because the incident in it is, as far as I'm concerned, the perfect example of the worst possible kind of normally functioning person in our modern world. It is people like the technician in the excerpt below who cloud the skies and keep the planes of the intelligence and the enthusiasm grounded. It is people like this who slow the essential work that humanity needs to do in order to save itself. (I know I sound dramatic, but -- damn it, I feel this way about shallow people. It is this kind of apathy and one-dimensionality that I try to fight against, every day, in the classroom.)