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The scenario many of us learned in school is that two X chromosomes make someone female, and an X and a Y chromosome make someone male. These are simplistic ways of thinking about what is scientifically very complex.

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In an excerpt from The Sky Below, Stanford-educated Scott Parazynski races against the clock to fix a damaged solar array before his spacesuit can no longer sustain life outside the shuttle Discovery.
Category: Stanford Medicine Unplugged