The Gate Tower Building skyscraper in Japan has a highway passing through its fifth, sixth and seventh floors.
7
The 1 yen coin can be used as a weight, because it weighs exactly one gram. Also, it can float on water.
19
Japanese engineers were asked to redesign the front end of the Bullet Train because it carried enough speed to create a sonic boom whenever it exited a tunnel. Residents could feel the blast from miles away.
11
The Japanese, on average, are the shortest people.
320