TOKYO -- Imagine some hikers are stranded deep in the mountains without food, and the closest help is hours or even days away. How do you keep them alive until their rescue?
Food-based robots eyed as help in rescues and beyond

The wings of the drone contain around 300 calories, in addition to whatever food and water it carries. (Photo courtesy of Jun Shintake)
TOKYO -- Imagine some hikers are stranded deep in the mountains without food, and the closest help is hours or even days away. How do you keep them alive until their rescue?