Kryptonians are a highly culturally and technologically advanced people. Computer projectors are the most technologically advanced projectors. Ygam, where they maintain a technologically and spiritually advanced society. China is one of the world's most technologically advanced nations. Seoul has a very technologically advanced infrastructure. Model trains today are more realistic, in addition to being much more technologically advanced. Some proposals envision technologically advanced trains reaching speeds of . Hamilton Sundstrand was among the largest global suppliers of technologically advanced aerospace and industrial products. Russia was militarily weak, technologically backward and administratively incompetent. Roman Empire was a technologically advanced civilization of antiquity. It is the second largest and most technologically advanced structure on campus. Czechoslovak designers projected a cheap but technologically innovative underground train. Amway Center is one of the most technologically advanced venues in the world. ESO has built and operated some of the largest and most technologically advanced telescopes. Some of the most technologically important innovations in history involved increases in energy efficiency.