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David Steinsaltz, J.W. Stubblefield, & J.E. Zuckerman

  • GenderRatio_HERO

    This Gender Mystery Starts Nine Months Before Birth

    • By David Steinsaltz, J.W. Stubblefield, & J.E. Zuckerman & others
    • August 7, 2015

    The ratio of boys to girls at conception has been misunderstood for centuries.