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X-ray crystallography revealed the structure of DNA | Image by Yikrazuul for Wikimedia
Crystallography is the study of the way atoms are arranged in solids. Scientist look at this because it turns out structure has a big impact on what materials look like, and how they work. Crystallography began with the study of crystals, like quartz, and today, crystallographers can study the architecture of any material that can form an orderly solid — from diamonds to viruses.
Scientists in this zone might be researching the molecular structures of proteins and DNA in the body (in fact, this was how the double helix structure of DNA was discovered). Or they might be working for a drug company, using computer models of molecules made by crystallographers to help create new drugs to treat disease.