In 2010, scientists grew slime mold in a dish, placing the mold in a central position representing Tokyo. They placed oats (major cities), and used light (which slime molds avoid) for mountains. The slime mold grew, nearly identically recreating the Tokyo Rail system.
Tokyo is not only the largest urban economy in the world, but also the largest city with a pop of 38 million people, has the world’s tallest tower Tokyo Skytree and the world’s largest underground floodwater diversion facility MAOUDC, and The Tokyo Metro Ginza Line is the oldest in Asia.
There are 5 enormous cylindrical shafts underneath of Tokyo, Japan which fill with water in case of a flood so it does not to destroy the city.
The Tokyo metropolitan area contains more people than the entire nation of Canada.