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The Death Galaxy shown in this video is composed of over 2,000 hexagonal patches on a silicon wafer that are designed to allow the evolution of bacteria in a two-dimensional micro-ecology. Waves of evolutionary development start in Goldilocks regions, where conditions are just right for bacterial evolution, and then propagate through to the whole ecology.
Reporters may freely use this video. Credit format: Video courtesy of Qiucen Zhang and Robert H. Austin, American Physical Society (2011).
Bacteria wave in Death Galaxy