In this episode of Rosalind Franklin, Dr Sarah Quinn examines how one of the 20th century's most important scientific discoveries - the structure of DNA - was credited to Watson and Crick while the woman whose experimental work made it possible was written out of history. We explore Rosalind Franklin's groundbreaking X-ray crystallography research at King's College London, including the famous 'Photo 51' that provided crucial evidence for DNA's double helix structure. The episode reveals how Franklin's data was shared without her permission, leading to Watson and Crick's Nobel Prize-winning model, while her contributions were minimized. We discuss the institutional sexism Franklin faced in 1950s academia, her continued research on RNA and virus structure at Birkbeck College, and her tragic death at 37. The episode examines the 'Matilda Effect' - the systematic erasure of women's scientific contributions - and how Franklin's story reflects broader patterns of gender discrimination in science. Today, Franklin is increasingly recognized as a pioneering scientist whose meticulous experimental work was essential to understanding life's fundamental building blocks. Her legacy reminds us to question popular narratives of scientific discovery and acknowledge all contributors to human knowledge, particularly those historically marginalized by academic institutions.