The robotic pet, such as Sony's Aibo, has become a popular form of entertainment and companionship for people who cannot keep real pets.
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.
The hybrid car, first introduced by Toyota in 1997, uses both gasoline and electric power to improve fuel efficiency and reduce emissions.
