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Mirror lab staff review the glass placed in the Giant Magellan Telescope mirror mold, checking for space. Credit: Damien Jemison/Giant Magellan Telescope – GMTO Corporation.

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Nettie Marie Stevens is shown here looking through a microscope while studying at the Stazione Zoologica in Naples, Italy.

Nettie Marie Stevens is shown here looking through a microscope while studying at the Stazione Zoologica in Naples, Italy, in 1909. In 1904, soon after getting her Ph.D. in biology, Stevens was awarded a grant from Carnegie Science. Her 1905 paper “Studies in Spermatogenesis with Especial Reference to the Accessory Chromosome” produced some of the first work offering cytological evidence demonstrating that the X and Y chromosomes were associated with sex determination. Image Courtesy Bryn Mawr College Special Collections. 
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Nettie Stevens Biography