In 1952, Rosalind Franklin produced an image so precise that it revealed the structure of life itself. Working in a basement lab at King’s College London, she used X-ray diffraction to photograph DNA. The result, later called Photograph 51, clearly showed a double helix.

Franklin did not rush to announce a theory. She was careful, trained to wait until the evidence was complete. While she worked, the image was shown to James Watson without her knowledge.

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Within months, Watson and Francis Crick built their model of DNA around Franklin’s data. In 1962, they won the Nobel Prize.

Franklin was dead by then. Her name did not appear on the prize. For years, it barely appeared in textbooks.

This is often told as an unfortunate episode in scientific history. But it was not. It was a pattern. And it has a name.

WHAT THE MATILDA EFFECT EXPLAINS

The Matilda Effect describes the systematic way women’s scientific contributions are ignored, minimised, or credited to men.

Coined by historian Margaret Rossiter, and named after early feminist Matilda Joslyn Gage, the term explains why science’s official record so often fails to match what actually happened in the lab.

It is not about one stolen idea or individual

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