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1895 Wilhelm Konrad von Roentgen discovered x-rays in Würzburg.

1. Which scientific discovery was key to cracking the DNA code?

2. What is x-ray crystallography and why is it important?

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1912–1915 First deduction and evidence of x-ray diffraction.

1915–1929 Evolution of x-ray crystallography, notably through the work of WH and WL Bragg, JD Bernal and others.

1929 Royal Institution conference of x-ray crystallography which set up three committees and organised the production and publication of International Tables for the Determination of Crystal Structures.