Researchers at the National Institute of Seoul South Korea created simple robots that do not require batteries or electricity for movement. They are able to move, to squirm, to tumble and move in different directions, using absorbed from the environment moisture.
The developers were inspired by the example of plants that are able to draw moisture from the air and earth, changing the shape and length depending on the situation. Some plants fold their leaves when moisture is sufficient, but I can dismiss them if you lack in nutrition.
Created by Korean engineers robots made from plant materials, they simply mimic the mechanisms of plants. The idea of developers is that such bots for water may become a natural source of energy. In addition, this method is non-toxic, unlike batteries, the creation of which frequently used toxic substances that can seriously pollute the environment. Moreover, if such robots to save even more, you can use them inside the human body for drug delivery, for example.
Kidrobot consist of two layers made of nanofibers. One of them absorbs the moisture and the other not. As soon as the boat gets damp, absorbent layer swells, causing it to shrink. Is layer to dry, as the boat returns to its original position. The repetition of these cycles allows the bots to move and to move independently.