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Discovering that they have been coerced into a career choice in support of other people's political agendas, and realizing they never had a passion for the subject to start with is a much bigger driver. Admitting this to oneself is a tough pill to swallow, so: harassment claims.
Research shows girls &women are just as talented and interested in science from an early age, even outperforming boys, but teachers, lecturers and other gatekeepers create roadblocks. Harassment is one many unjust reasons why sci careers can be untenable http://blogs.nature.com/soapboxscience/2014/09/04/nature-vs-nurture-girls-and-stem …
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