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The Secret Weapon of the Bullet Train
In 1989, Japan's Shin Kansan bullet train had a problem. The noise was coming from a variety of sources but whenever a train sped into a tunnel, it pushed waves of atmospheric pressure through the other end. Different components of the redesigned bullet train were based on different birds. When the redesign debuted in 1997, it was 10% faster and used 15% less electricity. It did all that with the wings of an owl, the belly of a penguin, and the nose of a kingfisher.