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Gerald N. Callahan has written 2 work(s)
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Product Description: What makes someone a boy or a girl? Is it external genitalia, chromosomes, DNA, environment, or some combination of these factors? Not even doctors or scientists are entirely clear. What is clear is that sex is not girl/boy or XX/XY, switching between two poles like an on/off switch on a radio...read more

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9781613736548 | Reprint edition (Chicago Review Pr, November 1, 2016), cover price $14.99 | About this edition: What makes someone a boy or a girl?

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