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The search is on for a couple to train as astronauts, for a privately funded mission to Mars. But wouldn't any couple squabble if cooped up together for 18 months? Explorer Deborah Shapiro, who spent more than a year with her husband in the Antarctic, provides some marital survival tips. It never ceases to amaze us, but the most common question Rolf and I got after our winter-over, when we spent…