The robotic pet, such as Sony's Aibo, has become a popular form of entertainment and companionship for people who cannot keep real pets.

Naruto, created by Masashi Kishimoto in 1999, is a popular manga and anime series that follows the adventures of a young ninja as he strives to become the strongest ninja in his village.

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.