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When Petra Cahill’s parents married in 1962, the pill was not yet legal, college tuition was a three-figure cost and most women didn't work outside the home.

When Petra Cahill’s parents married in 1962, the pill was not yet legal, college tuition was a three-figure cost and most women didn't work outside the home. She set out to learn how they stayed together in the face of a culture that has changed radically.