Machines this small tend to stick to everything they touch, the way sand sticks to your feet after a day at the beach, ... So we built these microrobots without any wheels or hinged joints, which must slide smoothly on their bearings. Instead, these robots move by bending their bodies like caterpillars. At very small scales, this machine is surprisingly fast.  -   National Institute     Quotes
Machines this small tend to stick to everything they touch, the way sand sticks to your feet after a day at the beach, ... So we built these microrobots without any wheels or hinged joints, which must slide smoothly on their bearings. Instead, these robots move by bending their bodies like caterpillars. At very small scales, this machine is surprisingly fast. National Institute