A new feat of microscale mechanical systems, or MEMS, this tiny "hand" developed by researchers at the University of California, in Los Angeles, is operated with gas pressure so that it can function in wet or dry environments. In this video, the hand detaches a one-millimeter-in-diameter fish egg, overcoming the surface tension that is strong at this scale. It does so gently enough not to crush the egg. No such MEMS device exists today.