If you look at the surface of a calm lake or pond, you will probably see little mosquito-like bugs zipping around the surface of that body of water. Those little bugs are known as striders and they are able to walk around on the surface of the water without getting wet. One of the things that striders are able to do is to jump off the surface of the water without breaking through the surface.
A group of researchers in South Korea has built a robotic water strider bug in an effort to find out exactly how the real bug is able to exert enough force on the water surface to jump without breaking the surface of the water. The robot creation is described in the current issue of Science.