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

David Steinsaltz, J.W. Stubblefield, & J.E. Zuckerman avatar consisting of their initials in a circle with a dark grey background and light grey text.

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Genetics

This Gender Mystery Starts Nine Months Before Birth

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

August 7, 2015