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J. D. Bernal
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<p>John Desmond Bernal <a href="/facts/Fellow_of_the_Royal_Society/cWs8TdC5">FRS</a> was an Irish scientist who pioneered the use of <a href="/facts/X-ray_crystallography/WtI0F5DN">X-ray crystallography</a> in <a href="/facts/Molecular_biology/YgqU35ub">molecular biology</a>. He published extensively on the <a href="/facts/History_of_science/pdBLPwP0">history of science</a>. In addition, Bernal wrote popular books on science and society. He was a <a href="/facts/Communist/PkUwa9xK">communist</a> activist and a member of the <a href="/facts/Communist_Party_of_Great_Britain/GFF6JLpS">Communist Party of Great Britain</a> (CPGB). </p>