In his bestselling memoir *The Double Helix*, James Watson told the story of DNA as a tale of sudden genius: Rosalind Franklin held the crucial X-ray data but "missed" the double helix, and it was he and Francis Crick who read the photograph and built the model first. That version has circulated for more than half a century, fixing Franklin in the role of the wronged woman of science.
Franklin's own laboratory notebooks tell a different story. Historians who worked through them found that she clearly distinguished the A and B forms of DNA, measured the DNA unit cell's size and symmetry, and realized the A form was "probably also helical, with two strands." She also wrote that the order of bases along a strand had no effect on the overall structure — "an infinite variety of nucleotide sequences" was possible — which is precisely the property that lets the double helix carry genetic information. In other words, the thing Watson claimed she missed, she had already grasped by the handle.
The evidence comes from a collection with a winding history: documents, photographs, and lab instruments from the race for DNA's structure changed hands several times before Philadelphia's Science History Institute purchased them and opened them to the public last September. Digitization is underway, and the institute plans a dedicated exhibition in 2027. The crown jewel is the original Photo 51 — the 1952 X-ray diffraction image of DNA made by Franklin and her student Raymond Gosling, the one Maurice Wilkins showed Watson without her permission. The archive also holds an early draft of *The Double Helix* and letters from peers questioning Watson's disparagement of Franklin in the book.
In 2023, historians Nathaniel Comfort and Matthew Cobb published in *Nature* what they found in the Churchill College archives at Cambridge: a never-published *Time* magazine draft, written by a journalist "in consultation with Franklin," describing the DNA work as a joint effort between the two groups — and a letter from one of Franklin's colleagues suggesting she knew her research was being shared with Crick. Their conclusion: rather than remembering Franklin as "the victim of the double helix," she should be seen as an equal contributor to the solution. Not everyone is convinced — medical historian Howard Markel of the University of Michigan still argues Franklin was simply "ripped off."
In 1962, Watson, Crick, and Wilkins shared the Nobel Prize in Physiology or Medicine. Franklin had died of cancer in 1958 at 37, and the prize is not awarded posthumously — her absence was permanent. Now, as the institute puts her letters, notebooks, and negatives online one by one, vice president Michelle DiMeo says she hopes people will "come and write the next book about Rosalind Franklin and others here." More than seventy years on, the fight over credit finally has a chance to let the primary sources speak for themselves.