How slime mold designed the Tokyo railway system

How slime mold designed the Tokyo railway system
Photo by Liam Burnett-Blue / Unsplash

Imagine if a single-celled organism, single handedly, designed the Tokyo Metro System? Well, this actually happened when a group of Japanese researchers at Hokkaido University put a slime mold on a map of Tokyo, to see how it would connect between urban hotspots.