# PNAS > **Machine-Evolution Nexus:** [[articles/Digital Darwinism and the Invisible World of Machine Evolution|Digital Darwinism and the Invisible World of Machine Evolution]] places this node within the history and governance of substrate-independent evolution. **Domain:** Scientific Publishing / Institution **Doc Type:** Canonical Wiki Node **Maturity:** Developed ## Definition _Proceedings of the National Academy of Sciences_ is a peer-reviewed multidisciplinary journal published by the U.S. National Academy of Sciences. ## Nexus Context It published the 2026 evolvable-AI argument and its active replies, moving population-level machine evolution into a current scholarly dispute. ## Evidence Boundary Publication establishes a citable research position, not consensus. The breeder-versus-ecosystem disagreement should remain visible rather than being flattened into prediction. ## Relationships [[wiki/Evolvable AI|Evolvable AI]], [[wiki/Maarten Boudry|Maarten Boudry]], [[wiki/Peer Review|Peer Review]], [[wiki/Nature|Nature]] ## Sources / Provenance - Müller, Steels and Szathmáry (2026) and linked PNAS replies.