Tokyo is Japan's largest city and the world's most populous metropolitan area, with over 37 million people.

Judo, a martial art that emphasizes throws and grappling techniques, was developed in Japan in the late 19th century and has become a popular sport around the world.

The bullet train (Shinkansen), which began operation in 1964, was the first high-speed train system in the world and is still one of the fastest.