Cornell University researchers have created microscale robots less than 1 millimeter in size that are printed as a 2D hexagonal “metasheet,” but with a jolt of electricity, morph into preprogrammed 3D shapes and crawl.Cornell University researchers have created microscale robots less than 1 millimeter in size that are printed as a 2D hexagonal “metasheet,” but with a jolt of electricity, morph into preprogrammed 3D shapes and crawl.[#item_full_content]