Japan has taken a step into the science-fiction world with the release of a "robot suit" that can help workers lift heavy loads or assist people with disabilities climb stairs. <...> "Humans may be able to mutate into supermen in the near future," said Yoshiyuki Sankai, professor and engineer at Tsukuba University who led the project. <...> Japan has seen a growing market for technology geared toward the elderly, who are making up an increasing chunk of the population as fewer younger Japanese choose to start families.