what did watson and crick discover

James Watson and Francis Crick discovered the structure of DNA, specifically the 3-dimensional double helix structure of DNA. They published their findings in a one-page paper titled "A Structure for Deoxyribose Nucleic Acid" in the British scientific weekly Nature on April 25, 1953. Their discovery was based on existing pieces of data, including X-ray crystallographic photographs of DNA taken by Rosalind Franklin, a chemist working in the lab of physicist Maurice Wilkins. Watson and Cricks discovery of the structure of DNA was a significant breakthrough in the field of genetics and has had a profound impact on modern biology and medicine.