Opposites don’t always attract. On each mission, there’s a tension between “the idealistic, impractical scientists” and “the stubborn, practical engineers,” as Squyres writes. On the good missions, this tension turns into a creative dance that brings out the best in both disciplines. But on the bad missions, “it’s an acid that eats away at the collaboration until it’s rotten.”77 The key to making the relationship work is combinatory play. The scientists learn some engineering, and the engineers learn some science. This approach was a top priority for Squyres. “If you came in,” he explains,
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