Read: Hidden Figures and the appeal of math in an age of inequality

One name sprang readily to mind: Jennifer Smith. Huerta-Snchez remembered reading a classic, decades-old paper in which Smith was thanked in the acknowledgments for ably programming and executing all the computations. That seemed odd. Today, programming is recognized as crucial work, and if a scientist did all the programming for a study, she would expect to be listed as an author. It was weird to me that Smith was not an author on that paper, Huerta-Snchez says. [Rori and I] wanted to see if there were more women like her.

The duo recruited five undergraduate students, who looked at every issue of a single journalTheoretical Population Biologypublished between 1970 and 1990. They pored through hard copies of almost 900 papers, pulled out every name in the acknowledgments, worked out whether they did any programming, and deduced their genders where possible. Rochelle Reyes, one of the students, says that she was extremely motivated to do this work, having grown up on stories of under-recognized pioneers like Rosalind Franklin, who was pivotal in deciphering the structure of DNA, and Henrietta Lacks, whose cells revolutionized medical research. I was fortunate to grow up in a diverse environment with a passion for science as well as social justice, Reyes says.

She and her colleagues found that in the 1970s, women accounted for 59 percent of acknowledged programmers, but just 7 percent of actual authors. That decade was a pivotal time for the field of population genetics, when the foundations of much modern research were laid. Based on authorship at the time, it seems that this research was conducted by a relatively small number of independent individual scientists, nearly all of whom were men, the team writes. But that wasnt the case.

Its hard to know what sort of contributions people in the past have made behind the scenes, says Jessica Abbott, a geneticist at Lund University. But this study shows that its possible to get the right kind of data if you think creatively.

Margaret Wu, for example, was thanked in a 1975 paper for help with the numerical work, and in particular for computing table I. She helped to create a statistical tool that scientists like Huerta-Snchez still regularly use to estimate how much genetic diversity there should be in a population of a given size. That tool is called the Watterson estimator, after the 1975 papers one and only authorG. A. Watterson. The paper has since been cited 3,400 times.

Skeptics might argue that the programmers listed in these old papers were just doing menial work that wasnt actually worthy of authorship. Rohlfs says thats unlikely, especially in the cases of Wu, Jennifer Smith, and Barbara McCann, who were repeatedly name-checked in many papers. They were doing work that was good enough that they were being called back again and again, she says. The team even talked with William Hill, Smiths former supervisor at the University of Edinburgh, who described her work as both technical and creative. (He didnt, unfortunately, know where Smith ended up, and the team never managed to track her down.)

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Women's History in Science Is Hidden in the Footnotes ...

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