"Because parents are transients in the maternity care system, there is little cumulative birth experience over successive generations of mothers. Women giving birth don't make the same mistakes as their mothers or grandmothers-they make new ones."

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Although scientific revolutions in how we see the world do occur, the bulk of our scientific understanding comes from the cumulative impact of numerous incremental studies that together paint an increasingly coherent picture of how nature works.

— Michael E. Mann