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.
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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