One of the greatest scientific achievements of the 20th century was the discovery of DNA’s double helix structure. James Watson and Francis Crick published their findings on April 25, 1953, but it’s been revealed that their crucial breakthrough depended on the work of another biologist, Rosalind Franklin, whose X-ray image, “Photo 51,” held the vital clue to decode the double helix. This program from NOVA reveals the shocking truth of this DNA discovery and details how close Franklin came to making the discovery herself. Distributed by PBS Distribution. (56 minutes)

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