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It is unimportant to dwell on why the astronauts have taken their risk. Undoubtedly, glory has something to do with it. So does sheer ego, plus the simpler notions of patriotism and unwillingness to let the team down. What is important is that individual valor can be preserved in a collective age. Hemingway once defined courage as "grace under pressure." In their balloon-shaped, ungainly suits, the Apollo 11 astronauts have demonstrated that man, despite his murderous and chaotic past, can still achieve a state of grace.