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At this point in the game’s development, Wise was not officially the composer; he figured that Koji Kondo, Nintendo’s go-to composer who worked on Super Mario and Legend of Zelda �������t¶��, would take over.

Koji Murata, one of the scientists behind the project, points out that in the early 1900s, “airplanes were made of wood.”

For the last seven years, Kammerer has been working with koji mold, or Aspergillus oryzae, which is widely used in Japanese cuisine to ferment soybeans and make things like soy sauce and miso.

In the last decade, "koji's kind of been the star of the show, but it seems like a very similar process and technique," said Kammerer.

Koji Agatsuma, Hitachi Rail’s technical chief, who oversaw the company's battery train project, says there is now interest in the UK thanks to a mix of technological improvement and a change in political climate.