Wearable robotic tail gives humans better balance

Millions of years after the ancestors of humans evolved to lose their tails, a research team at Japan's Keio University have built a robotic one they say could help unsteady elderly people keep their balance. Dubbed Arque, the grey one-meter device mimics tails such as those of cheetahs and other animals used to keep their balance while running and climbing, according to the Keio team.