# Double Helix > **Machine-Evolution Nexus:** [[articles/Digital Darwinism and the Invisible World of Machine Evolution|Digital Darwinism and the Invisible World of Machine Evolution]] places this concept within the history and governance of substrate-independent evolution. **Domain:** Molecular Biology / History **Doc Type:** Canonical Wiki Node **Maturity:** Developed ## Definition The double helix is the paired, antiparallel structure of DNA in which complementary bases enable stable storage and templated copying. ## Machine-Evolution Context Its 1953 description made biological hereditary architecture legible in the same season Barricelli was running artificial evolutionary populations at the IAS. ## Continuity and Evidence Boundary The model depended on experimental evidence, especially X-ray diffraction, and should not be reduced to a two-person discovery story. ## Relationships [[wiki/DNA|DNA]], [[wiki/Rosalind Franklin|Rosalind Franklin]], [[wiki/Maurice Wilkins|Maurice Wilkins]], [[wiki/X-ray Diffraction|X-ray Diffraction]] ## Sources / Provenance - Watson and Crick, _Nature_ 171 (1953); Franklin and Gosling, _Nature_ 171 (1953).