When placed at the perimeter of a maze with food in the center, the plasmodial slime mold Physarum polycephalum explores the maze, retracts branches from dead-end corridors, and then grows exclusively along the shortest path possible to the food. How does Physarum do this? One theory is that it leaves behind slime deposits−−an externalized "memory" that "reminds" it not to retry dead ends.
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When placed at the perimeter of a maze with food in the center, the plasmodial slime mold Physarum p...
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