TOKYO -- At a university lab in a Tokyo suburb, engineering students are wiring a rubbery robot face to simulate six basic expressions: anger, fear, sadness, happiness, surprise and disgust. Hooked up ...

Japan’s population is the oldest in the world, with a third aged over 65, and one in 10 aged over 80, due to a combination of low fertility rates and high life expectancy. This has a direct effect on ...