Forget batteries: this tiny, wriggly robot runs on moisture

Forget batteries and electricity — the tiny robots of the future could run on moisture.Researchers at Seoul National University in South Korea, have created robots that can “inchworm” forward by absorbing humidity from their surrounding environment. The so-called hygrobots, described this week in the journal Science Robotics, can crawl, wriggle back and forth, and twist like a snake. And in the future, they could be used for a variety of applications, including delivering drug